diff --git a/other/java/client/src/main/java/seaweedfs/client/SeaweedRead.java b/other/java/client/src/main/java/seaweedfs/client/SeaweedRead.java
index 23fb14ebb..cac85d186 100644
--- a/other/java/client/src/main/java/seaweedfs/client/SeaweedRead.java
+++ b/other/java/client/src/main/java/seaweedfs/client/SeaweedRead.java
@@ -103,7 +103,7 @@ public class SeaweedRead {
             chunkCache.setChunk(chunkView.fileId, chunkData);
         }
 
-        int len = (int) chunkView.size;
+        int len = (int) chunkView.size - (int) (startOffset - chunkView.logicOffset);
         LOG.debug("readChunkView fid:{} chunkData.length:{} chunkView.offset:{} chunkView[{};{}) startOffset:{}",
                 chunkView.fileId, chunkData.length, chunkView.offset, chunkView.logicOffset, chunkView.logicOffset + chunkView.size, startOffset);
         buf.put(chunkData, (int) (startOffset - chunkView.logicOffset + chunkView.offset), len);