diff --git a/docs/example/multipart_upload.md b/docs/example/multipart_upload.md
index ed55365..1e92dc8 100644
--- a/docs/example/multipart_upload.md
+++ b/docs/example/multipart_upload.md
@@ -164,6 +164,73 @@ Attention: the example below is just to show you how to resolve some streams to
 
 ```
 
+#### Use Bucket Objects as Data Sources for Multipart Uploads
+
+When you need to copy an object larger than 5GB, you must use UploadPartCopy because the CopyObject API has a maximum size limit of 5GB for copied objects.
+
+1. Define the part size.
+2. Use copy-range to get a part of the source object data as the content of each part.
+3. Finally, merge the parts.
+
+```java
+String objectKey = "your_object_name";
+
+Bucket.InitiateMultipartUploadInput inputInit = new Bucket.InitiateMultipartUploadInput();
+InitiateMultipartUploadOutput initOutput = bucket.initiateMultipartUpload(objectKey, inputInit);
+String uploadID = initOutput.getUploadID();
+System.out.println("-uploadID----" + initOutput.getUploadID());
+
+// The bucket where the source object is located
+String srcBucket = "src-bucket";
+// Source object key
+String srcKey = "src-key";
+ // Record uploaded parts
+List<Types.ObjectPartModel> parts = new ArrayList<>();
+
+HeadObjectOutput headResp = bucket.headObject(srcKey, null);
+// Get the source object size.
+long srcSize = headResp.getContentLength();
+// Define the part size
+long partSize = 5 * 1024 * 1024; // Set part size to 5 MB.
+// Step 2: Upload parts
+long bytePos = 0;
+for (int i = 0; bytePos < srcSize; i++) {
+    long rangeEnd = Math.min(bytePos + partSize - 1, (srcSize - 1));
+    Bucket.UploadMultipartInput input = new Bucket.UploadMultipartInput();
+    input.setPartNumber(i);
+    input.setUploadID(uploadID);
+    input.setXQSCopySource(srcBucket + "/" + srcKey);
+    input.setXQSCopyRange(String.format("bytes=%d-%d", bytePos, rangeEnd));
+    // Create a request to upload a part.
+    UploadMultipartOutput partResp = bucket.uploadMultipart(objectKey, input);
+    // Tip: In production code, please add correctness check: partResp.getStatueCode() == 201
+
+    bytePos += partSize;
+    Types.ObjectPartModel part = new Types.ObjectPartModel();
+    part.setPartNumber(i);
+    part.setEtag(partResp.getETag());
+    parts.add(part);
+}
+
+// Step 3: Complete.
+Bucket.CompleteMultipartUploadInput completeInput = new Bucket.CompleteMultipartUploadInput();
+// Set the uploadID and part information to be merged.
+completeInput.setUploadID(uploadID);
+completeInput.setObjectParts(parts);
+Bucket.CompleteMultipartUploadOutput output = bucket.completeMultipartUpload(objectKey, completeInput);
+if (output.getStatueCode() == 201) {
+  System.out.println("success");
+}
+```
+
+Here are some additional notes:
+
+* The `XQSCopySource` and `XQSCopyRange` parameters are used to specify the source object and the range of bytes to be copied for each part.
+* The `ETag` of each part is returned in the `UploadMultipartOutput` object. This ETag is used to verify the integrity of the part.
+* The `CompleteMultipartUploadInput` object contains the list of parts to be merged.
+* The `CompleteMultipartUploadOutput` object indicates whether the merge operation was successful.
+
+
 #### List all the parts uploaded
 
 If upload failed, you can call this method to list all of the parts uploaded.
diff --git a/docs/example/multipart_upload_zh-CN.md b/docs/example/multipart_upload_zh-CN.md
index 5883cac..83e3179 100644
--- a/docs/example/multipart_upload_zh-CN.md
+++ b/docs/example/multipart_upload_zh-CN.md
@@ -1,9 +1,5 @@
 ## 大文件分段上传
 
-### 代码片段
-
-#### 本地已有完整文件使用分段上传
-
 用 access-key-id 和 secret-access-key 初始化 Bucket 服务。
 
 ```java
@@ -15,6 +11,10 @@ Bucket bucket = new Bucket(env, zoneKey, bucketName);
 
 然后您可以分段上传对象：
 
+### 代码片段
+
+#### 本地已有完整文件使用分段上传
+
 ```java
 String objectName = "your_object_name";
 
@@ -157,6 +157,65 @@ bucket.completeMultipartUpload(objectKey, completeMultipartUploadInput);
 
 ```
 
+#### 分段上传时使用桶内对象作为数据源
+
+当需要复制某个大小超过 5G 的对象, 因为 CopyObject API 对于复制的对象有最大 5G 的大小限制,
+此时就必须使用 UploadPartCopy:
+1. 定义分段大小
+2. 借助 copy-range, 一次获取源对象的一部分数据作为各个 part 内容
+3. 最后合并分段
+
+```java
+String objectKey = "your_object_name";
+
+Bucket.InitiateMultipartUploadInput inputInit = new Bucket.InitiateMultipartUploadInput();
+InitiateMultipartUploadOutput initOutput = bucket.initiateMultipartUpload(objectKey, inputInit);
+String uploadID = initOutput.getUploadID();
+System.out.println("-uploadID----" + initOutput.getUploadID());
+
+// 源 object 所在的 bucket
+String srcBucket = "src-bucket";
+// 源 object key
+String srcKey = "src-key";
+ // 记录已上传的 parts
+List<Types.ObjectPartModel> parts = new ArrayList<>();
+
+HeadObjectOutput headResp = bucket.headObject(srcKey, null);
+// 获取源 object size.
+long srcSize = headResp.getContentLength();
+// 定义分段大小
+long partSize = 5 * 1024 * 1024; // Set part size to 5 MB.
+// 第2步：上传分段
+long bytePos = 0;
+for (int i = 0; bytePos < srcSize; i++) {
+    long rangeEnd = Math.min(bytePos + partSize - 1, (srcSize - 1));
+    Bucket.UploadMultipartInput input = new Bucket.UploadMultipartInput();
+    input.setPartNumber(i);
+    input.setUploadID(uploadID);
+    input.setXQSCopySource(srcBucket + "/" + srcKey);
+    input.setXQSCopyRange(String.format("bytes=%d-%d", bytePos, rangeEnd));
+    // 创建请求上传一个分段.
+    UploadMultipartOutput partResp = bucket.uploadMultipart(objectKey, input);
+    // 提示: 生产代码请加上正确性检查: partResp.getStatueCode() == 201
+
+    bytePos += partSize;
+    Types.ObjectPartModel part = new Types.ObjectPartModel();
+    part.setPartNumber(i);
+    part.setEtag(partResp.getETag());
+    parts.add(part);
+}
+
+// 第3步: 完成.
+Bucket.CompleteMultipartUploadInput completeInput = new Bucket.CompleteMultipartUploadInput();
+// 设置要执行合并的 uploadID 和分片信息.
+completeInput.setUploadID(uploadID);
+completeInput.setObjectParts(parts);
+Bucket.CompleteMultipartUploadOutput output = bucket.completeMultipartUpload(objectKey, completeInput);
+if (output.getStatueCode() == 201) {
+    System.out.println("success");
+}
+```
+
 #### 查看已上传的分段
 
 分段上传失败之后可以尝试访问以下方法查看是否是所有的分段都已上传完成