diff --git a/src/main/java/org/redkale/convert/json/JsonByteBufferWriter.java b/src/main/java/org/redkale/convert/json/JsonByteBufferWriter.java
index 99e8bfed8..455ca94c3 100644
--- a/src/main/java/org/redkale/convert/json/JsonByteBufferWriter.java
+++ b/src/main/java/org/redkale/convert/json/JsonByteBufferWriter.java
@@ -22,9 +22,11 @@ import org.redkale.util.*;
  */
 public class JsonByteBufferWriter extends JsonWriter {
 
-    private static final char[] CHARS_TUREVALUE = "true".toCharArray();
+    private static final byte[] BYTES_TUREVALUE = "true".getBytes();
 
-    private static final char[] CHARS_FALSEVALUE = "false".toCharArray();
+    private static final byte[] BYTES_FALSEVALUE = "false".getBytes();
+
+    private static final byte[] BYTES_NULL = new byte[] {'n', 'u', 'l', 'l'};
 
     protected Charset charset;
 
@@ -313,6 +315,11 @@ public class JsonByteBufferWriter extends JsonWriter {
         return size;
     }
 
+    @Override
+    public final void writeNull() {
+        writeTo(BYTES_NULL);
+    }
+
     /**
      * <b>注意：</b> 该String值不能为null且不会进行转义， 只用于不含需要转义字符的字符串，例如enum、double、BigInteger、BigDecimal转换的String
      *
@@ -361,6 +368,9 @@ public class JsonByteBufferWriter extends JsonWriter {
 
     @Override
     public boolean writeFieldBooleanValue(Object fieldArray, boolean comma, boolean value) {
+        if (!value && tiny()) {
+            return comma;
+        }
         return writeFieldLatin1Value(fieldArray, comma, false, String.valueOf(value));
     }
 
@@ -386,8 +396,13 @@ public class JsonByteBufferWriter extends JsonWriter {
 
     @Override
     public boolean writeFieldObjectValue(Object fieldArray, boolean comma, Encodeable encodeable, Object value) {
-        if (value == null && !nullable()) {
-            return comma;
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         byte[] bs1 = (byte[]) fieldArray;
         int expandsize = expand(1 + bs1.length);
@@ -411,7 +426,15 @@ public class JsonByteBufferWriter extends JsonWriter {
 
     @Override
     public boolean writeFieldStringValue(Object fieldArray, boolean comma, String value) {
-        if (value == null || (tiny() && value.isEmpty())) {
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
+        }
+        if (tiny() && value.isEmpty()) {
             return comma;
         }
         byte[] bs1 = (byte[]) fieldArray;
@@ -434,9 +457,45 @@ public class JsonByteBufferWriter extends JsonWriter {
         return true;
     }
 
+    @Override
+    protected void writeFieldNull(Object fieldArray, boolean comma) {
+        byte[] bs1 = (byte[]) fieldArray;
+        byte[] bs2 = BYTES_NULL;
+        int expandsize = expand(bs1.length + bs2.length + 3);
+        if (expandsize == 0) { // 只需要一个buffer
+            final ByteBuffer buffer = this.buffers[currBufIndex];
+            if (comma) buffer.put(BYTE_COMMA);
+            buffer.put(bs1);
+            buffer.put(bs2);
+        } else {
+            ByteBuffer buffer = this.buffers[currBufIndex];
+            if (comma) buffer.put(BYTE_COMMA);
+            for (byte b : bs1) {
+                if (!buffer.hasRemaining()) {
+                    buffer = nextByteBuffer();
+                }
+                buffer.put(b);
+            }
+            for (byte b : bs2) {
+                if (!buffer.hasRemaining()) {
+                    buffer = nextByteBuffer();
+                }
+                buffer.put(b);
+            }
+        }
+    }
+
     @Override
     protected boolean writeFieldLatin1Value(Object fieldArray, boolean comma, boolean quote, String value) {
-        if (value == null || (tiny() && value.isEmpty())) {
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
+        }
+        if (tiny() && value.isEmpty()) {
             return comma;
         }
         byte[] bs1 = (byte[]) fieldArray;
@@ -482,7 +541,7 @@ public class JsonByteBufferWriter extends JsonWriter {
 
     @Override
     public void writeBoolean(boolean value) {
-        writeTo(value ? CHARS_TUREVALUE : CHARS_FALSEVALUE);
+        writeTo(value ? BYTES_TUREVALUE : BYTES_FALSEVALUE);
     }
 
     @Override
diff --git a/src/main/java/org/redkale/convert/json/JsonBytesWriter.java b/src/main/java/org/redkale/convert/json/JsonBytesWriter.java
index 374bdc625..96514a3f0 100644
--- a/src/main/java/org/redkale/convert/json/JsonBytesWriter.java
+++ b/src/main/java/org/redkale/convert/json/JsonBytesWriter.java
@@ -109,7 +109,7 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
     }
 
     @Override
-    public void writeNull() {
+    public final void writeNull() {
         writeTo(BYTES_NULL);
     }
 
@@ -186,6 +186,9 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
 
     @Override
     public boolean writeFieldBooleanValue(Object fieldArray, boolean comma, boolean value) {
+        if (!value && tiny()) {
+            return comma;
+        }
         byte[] bs1 = (byte[]) fieldArray;
         byte[] bs2 = value ? BYTES_TUREVALUE : BYTES_FALSEVALUE;
         int len1 = bs1.length;
@@ -245,8 +248,13 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
 
     @Override
     public boolean writeFieldObjectValue(Object fieldArray, boolean comma, Encodeable encodeable, Object value) {
-        if (value == null && !nullable()) {
-            return comma;
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         byte[] bs1 = (byte[]) fieldArray;
         int len1 = bs1.length;
@@ -260,7 +268,15 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
 
     @Override
     public boolean writeFieldStringValue(Object fieldArray, boolean comma, String value) {
-        if (value == null || (tiny() && value.isEmpty())) {
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
+        }
+        if (tiny() && value.isEmpty()) {
             return comma;
         }
         byte[] bs1 = (byte[]) fieldArray;
@@ -273,9 +289,31 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
         return true;
     }
 
+    @Override
+    protected void writeFieldNull(Object fieldArray, boolean comma) {
+        byte[] bs1 = (byte[]) fieldArray;
+        byte[] bs2 = BYTES_NULL;
+        int len1 = bs1.length;
+        int len2 = bs2.length;
+        byte[] src = expand(1 + len1 + len2);
+        if (comma) src[count++] = BYTE_COMMA;
+        System.arraycopy(bs1, 0, src, count, len1);
+        count += len1;
+        System.arraycopy(bs2, 0, src, count, len2);
+        count += len2;
+    }
+
     @Override
     protected boolean writeFieldLatin1Value(Object fieldArray, boolean comma, boolean quote, String value) {
-        if (value == null || (tiny() && value.isEmpty())) {
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
+        }
+        if (tiny() && value.isEmpty()) {
             return comma;
         }
         byte[] bs1 = (byte[]) fieldArray;
diff --git a/src/main/java/org/redkale/convert/json/JsonCharsWriter.java b/src/main/java/org/redkale/convert/json/JsonCharsWriter.java
index 967737f93..6f83d5dfd 100644
--- a/src/main/java/org/redkale/convert/json/JsonCharsWriter.java
+++ b/src/main/java/org/redkale/convert/json/JsonCharsWriter.java
@@ -27,6 +27,8 @@ public class JsonCharsWriter extends JsonWriter {
 
     private static final char[] CHARS_FALSEVALUE = "false".toCharArray();
 
+    private static final char[] CHARS_NULL = new char[] {'n', 'u', 'l', 'l'};
+
     private static final int TENTHOUSAND_MAX = 10001;
 
     private static final char[][] TENTHOUSAND_CHARS = new char[TENTHOUSAND_MAX][];
@@ -141,6 +143,9 @@ public class JsonCharsWriter extends JsonWriter {
 
     @Override
     public boolean writeFieldBooleanValue(Object fieldArray, boolean comma, boolean value) {
+        if (!value && tiny()) {
+            return comma;
+        }
         char[] bs1 = (char[]) fieldArray;
         char[] bs2 = value ? CHARS_TUREVALUE : CHARS_FALSEVALUE;
         int len1 = bs1.length;
@@ -200,8 +205,13 @@ public class JsonCharsWriter extends JsonWriter {
 
     @Override
     public boolean writeFieldObjectValue(Object fieldArray, boolean comma, Encodeable encodeable, Object value) {
-        if (value == null && !nullable()) {
-            return comma;
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         char[] bs1 = (char[]) fieldArray;
         int len1 = bs1.length;
@@ -215,7 +225,15 @@ public class JsonCharsWriter extends JsonWriter {
 
     @Override
     public boolean writeFieldStringValue(Object fieldArray, boolean comma, String value) {
-        if (value == null || (tiny() && value.isEmpty())) {
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
+        }
+        if (tiny() && value.isEmpty()) {
             return comma;
         }
         char[] bs1 = (char[]) fieldArray;
@@ -228,9 +246,31 @@ public class JsonCharsWriter extends JsonWriter {
         return true;
     }
 
+    @Override
+    protected void writeFieldNull(Object fieldArray, boolean comma) {
+        char[] bs1 = (char[]) fieldArray;
+        char[] bs2 = CHARS_NULL;
+        int len1 = bs1.length;
+        int len2 = bs2.length;
+        char[] src = expand(1 + len1 + len2);
+        if (comma) src[count++] = BYTE_COMMA;
+        System.arraycopy(bs1, 0, src, count, len1);
+        count += len1;
+        System.arraycopy(bs2, 0, src, count, len2);
+        count += len2;
+    }
+
     @Override
     protected boolean writeFieldLatin1Value(Object fieldArray, boolean comma, boolean quote, String value) {
-        if (value == null || (tiny() && value.isEmpty())) {
+        if (value == null) {
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
+        }
+        if (tiny() && value.isEmpty()) {
             return comma;
         }
         char[] bs1 = (char[]) fieldArray;
@@ -265,6 +305,11 @@ public class JsonCharsWriter extends JsonWriter {
         return this.count;
     }
 
+    @Override
+    public final void writeNull() {
+        writeTo(CHARS_NULL);
+    }
+
     @Override
     public void writeString(String value) {
         if (value == null) {
diff --git a/src/main/java/org/redkale/convert/json/JsonWriter.java b/src/main/java/org/redkale/convert/json/JsonWriter.java
index 2dc8f4f88..449fc09f6 100644
--- a/src/main/java/org/redkale/convert/json/JsonWriter.java
+++ b/src/main/java/org/redkale/convert/json/JsonWriter.java
@@ -22,8 +22,6 @@ public abstract class JsonWriter extends Writer {
             "redkale.convert.json.writer.buffer.defsize",
             Integer.getInteger("redkale.convert.writer.buffer.defsize", 1024));
 
-    private static final char[] CHARS_NULL = new char[] {'n', 'u', 'l', 'l'};
-
     protected static final byte BYTE_NEGATIVE = '-';
 
     protected static final byte BYTE_COMMA = ',';
@@ -61,12 +59,11 @@ public abstract class JsonWriter extends Writer {
     // -----------------------------------------------------------------------
     public abstract void writeTo(final char ch); // 只能是 0 - 127 的字符
 
-    public abstract void writeTo(final char[] chs, final int start, final int len); // 只能是 0 - 127 的字符
+    public abstract void writeTo(final char[] cs, final int start, final int len); // 只能是 0 - 127 的字符
 
     public abstract void writeTo(final byte ch); // 只能是 0 - 127 的字符
 
-    public abstract void writeTo(final byte[] chs, final int start, final int len); // 只能是 0 - 127 的字符
-
+    public abstract void writeTo(final byte[] bs, final int start, final int len); // 只能是 0 - 127 的字符
     /**
      * <b>注意：</b> 该String值不能为null且不会进行转义， 只用于不含需要转义字符的字符串，例如enum、double、BigInteger、BigDecimal转换的String
      *
@@ -76,6 +73,10 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public abstract void writeLatin1To(final boolean quote, final String value);
 
+    @Override
+    @ClassDepends
+    public abstract void writeNull();
+
     // ---------------------------- writeFieldXXXValue 调用前不需要判断值是否为null ----------------------------
     @ClassDepends
     public abstract boolean writeFieldBooleanValue(Object fieldArray, boolean comma, boolean value);
@@ -110,7 +111,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldBooleanValue(Object fieldArray, boolean comma, Boolean value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldBooleanValue(fieldArray, comma, value.booleanValue());
     }
@@ -118,7 +124,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldByteValue(Object fieldArray, boolean comma, Byte value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldByteValue(fieldArray, comma, value.byteValue());
     }
@@ -126,7 +137,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldShortValue(Object fieldArray, boolean comma, Short value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldShortValue(fieldArray, comma, value.shortValue());
     }
@@ -134,7 +150,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldCharValue(Object fieldArray, boolean comma, Character value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldIntValue(fieldArray, comma, value.charValue());
     }
@@ -142,7 +163,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldIntValue(Object fieldArray, boolean comma, Integer value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldIntValue(fieldArray, comma, value.intValue());
     }
@@ -150,7 +176,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldFloatValue(Object fieldArray, boolean comma, Float value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldLatin1Value(fieldArray, comma, false, String.valueOf(value));
     }
@@ -158,7 +189,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldLongValue(Object fieldArray, boolean comma, Long value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldLongValue(fieldArray, comma, value.longValue());
     }
@@ -166,7 +202,12 @@ public abstract class JsonWriter extends Writer {
     @ClassDepends
     public final boolean writeFieldDoubleValue(Object fieldArray, boolean comma, Double value) {
         if (value == null) {
-            return comma;
+            if (nullable()) {
+                writeFieldNull(fieldArray, comma);
+                return true;
+            } else {
+                return comma;
+            }
         }
         return writeFieldLatin1Value(fieldArray, comma, false, String.valueOf(value));
     }
@@ -183,6 +224,8 @@ public abstract class JsonWriter extends Writer {
     public abstract boolean writeFieldObjectValue(
             Object fieldArray, boolean comma, Encodeable encodeable, Object value);
 
+    protected abstract void writeFieldNull(Object fieldArray, boolean comma);
+
     protected abstract boolean writeFieldLatin1Value(Object fieldArray, boolean comma, boolean quote, String value);
 
     // ---------------------------- writeFieldXXXValue 主要供JsonDynEncoder使用 ----------------------------
@@ -228,12 +271,12 @@ public abstract class JsonWriter extends Writer {
     }
 
     // ----------------------------------------------------------------------------------------------
-    public final void writeTo(final char... chs) { // 只能是 0 - 127 的字符
-        writeTo(chs, 0, chs.length);
+    public final void writeTo(final char... cs) { // 只能是 0 - 127 的字符
+        writeTo(cs, 0, cs.length);
     }
 
-    public final void writeTo(final byte[] chs) { // 只能是 0 - 127 的字符
-        writeTo(chs, 0, chs.length);
+    public final void writeTo(final byte[] bs) { // 只能是 0 - 127 的字符
+        writeTo(bs, 0, bs.length);
     }
 
     @Override
@@ -290,11 +333,6 @@ public abstract class JsonWriter extends Writer {
         writeTo(BYTE_RBRACE);
     }
 
-    @Override
-    public void writeNull() {
-        writeTo(CHARS_NULL);
-    }
-
     @Override
     public final void writeArrayB(int size, Encodeable componentEncoder, Object obj) {
         writeTo(BYTE_LBRACKET);