diff --git a/src/org/redkale/convert/Convert.java b/src/org/redkale/convert/Convert.java
index 32e2240ae..1f7298a5e 100644
--- a/src/org/redkale/convert/Convert.java
+++ b/src/org/redkale/convert/Convert.java
@@ -50,6 +50,9 @@ public abstract class Convert<R extends Reader, W extends Writer> {
 
     public abstract <T> T convertFrom(final Type type, final byte[] bytes);
 
+    //@since 2.2.0
+    public abstract <T> T convertFrom(final Type type, final byte[] bytes, final int offset, final int length);
+
     public abstract <T> T convertFrom(final Type type, final ByteBuffer... buffers);
 
     public abstract <T> T convertFrom(final Type type, final ConvertMask mask, final ByteBuffer... buffers);
diff --git a/src/org/redkale/convert/bson/BsonConvert.java b/src/org/redkale/convert/bson/BsonConvert.java
index 0bd2ba225..0cf9032a1 100644
--- a/src/org/redkale/convert/bson/BsonConvert.java
+++ b/src/org/redkale/convert/bson/BsonConvert.java
@@ -115,11 +115,12 @@ public class BsonConvert extends BinaryConvert<BsonReader, BsonWriter> {
         return convertFrom(type, bytes, 0, bytes.length);
     }
 
+    @Override
     @SuppressWarnings("unchecked")
-    public <T> T convertFrom(final Type type, final byte[] bytes, final int start, final int len) {
+    public <T> T convertFrom(final Type type, final byte[] bytes, final int offset, final int len) {
         if (type == null) return null;
         final BsonReader in = readerPool.get();
-        in.setBytes(bytes, start, len);
+        in.setBytes(bytes, offset, len);
         @SuppressWarnings("unchecked")
         T rs = (T) factory.loadDecoder(type).convertFrom(in);
         readerPool.accept(in);
diff --git a/src/org/redkale/convert/json/JsonConvert.java b/src/org/redkale/convert/json/JsonConvert.java
index e3c0eff62..45c0e35eb 100644
--- a/src/org/redkale/convert/json/JsonConvert.java
+++ b/src/org/redkale/convert/json/JsonConvert.java
@@ -110,6 +110,12 @@ public class JsonConvert extends TextConvert<JsonReader, JsonWriter> {
         return convertFrom(type, new String(bytes, StandardCharsets.UTF_8));
     }
 
+    @Override
+    public <T> T convertFrom(final Type type, final byte[] bytes, final int offset, final int length) {
+        if (bytes == null) return null;
+        return convertFrom(type, new String(bytes, offset, length, StandardCharsets.UTF_8));
+    }
+
     public <T> T convertFrom(final Type type, final String text) {
         if (text == null) return null;
         return convertFrom(type, Utility.charArray(text));
@@ -120,10 +126,10 @@ public class JsonConvert extends TextConvert<JsonReader, JsonWriter> {
         return convertFrom(type, text, 0, text.length);
     }
 
-    public <T> T convertFrom(final Type type, final char[] text, final int start, final int len) {
+    public <T> T convertFrom(final Type type, final char[] text, final int offset, final int length) {
         if (text == null || type == null) return null;
         final JsonReader in = readerPool.get();
-        in.setText(text, start, len);
+        in.setText(text, offset, length);
         T rs = (T) factory.loadDecoder(type).convertFrom(in);
         readerPool.accept(in);
         return rs;
@@ -166,10 +172,10 @@ public class JsonConvert extends TextConvert<JsonReader, JsonWriter> {
     }
 
     //返回非null的值是由String、ArrayList、HashMap任意组合的对象
-    public <V> V convertFrom(final char[] text, final int start, final int len) {
+    public <V> V convertFrom(final char[] text, final int offset, final int length) {
         if (text == null) return null;
         final JsonReader in = readerPool.get();
-        in.setText(text, start, len);
+        in.setText(text, offset, length);
         Object rs = new AnyDecoder(factory).convertFrom(in);
         readerPool.accept(in);
         return (V) rs;