diff --git a/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java b/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java
index bb7c46ee3..fd2af56a6 100644
--- a/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java
+++ b/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java
@@ -197,50 +197,47 @@ public final class JsonByteBufferWriter extends JsonWriter {
             writeNull();
             return;
         }
-        ByteBuffer buffer = this.buffers[index];
-        expand(1);
-        if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-        buffer.put((byte) '"');
-
-        for (char ch : Utility.charArray(value)) {
+        final char[] chs = Utility.charArray(value);
+        int len = 0;
+        for (char ch : chs) {
             switch (ch) {
-                case '\n': expand(2);
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '\\');
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) 'n');
+                case '\n': len += 2;
                     break;
-                case '\r': expand(2);
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '\\');
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) 'r');
+                case '\r': len += 2;
                     break;
-                case '\t': expand(2);
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '\\');
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) 't');
+                case '\t': len += 2;
                     break;
-                case '\\': expand(2);
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '\\');
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '\\');
+                case '\\': len += 2;
                     break;
-                case '"': expand(2);
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '\\');
-                    if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-                    buffer.put((byte) '"');
+                case '"': len += 2;
                     break;
-                default: buffer = putChar(buffer, ch);
+                default: len++;
                     break;
             }
         }
-        expand(1);
-        if (!buffer.hasRemaining()) buffer = nextByteBuffer();
-        buffer.put((byte) '"');
+        if (len == chs.length) {
+            writeTo(true, chs, 0, len);
+        } else {
+            StringBuilder sb = new StringBuilder(len);
+            for (char ch : chs) {
+                switch (ch) {
+                    case '\n': sb.append("\\n");
+                        break;
+                    case '\r': sb.append("\\r");
+                        break;
+                    case '\t': sb.append("\\t");
+                        break;
+                    case '\\': sb.append("\\\\");
+                        break;
+                    case '"': sb.append("\\\"");
+                        break;
+                    default: sb.append(ch);
+                        break;
+                }
+            }
+            char[] cs = Utility.charArray(sb);
+            writeTo(true, cs, 0, sb.length());
+        }
     }
 
     @Override