diff --git a/lib/common/multipart.js b/lib/common/multipart.js
index c1ab0ad53..51742faf2 100644
--- a/lib/common/multipart.js
+++ b/lib/common/multipart.js
@@ -1,6 +1,7 @@
 
 const copy = require('copy-to');
 const callback = require('./callback');
+const deepCopy = require('./utils/deepCopy');
 
 const proto = exports;
 
@@ -181,8 +182,9 @@ proto.completeMultipartUpload = async function completeMultipartUpload(name, upl
   xml += '</CompleteMultipartUpload>';
 
   options = options || {};
-  const opt = {};
-  copy(options).to(opt);
+  let opt = {};
+  opt = deepCopy(options);
+  if (opt.headers) delete opt.headers['x-oss-server-side-encryption'];
   opt.subres = { uploadId };
 
   const params = this._objectRequestParams('POST', name, opt);
diff --git a/lib/common/utils/deepCopy.js b/lib/common/utils/deepCopy.js
new file mode 100644
index 000000000..c346bd066
--- /dev/null
+++ b/lib/common/utils/deepCopy.js
@@ -0,0 +1,20 @@
+module.exports = function deepCopy(obj, cache = []) {
+  if (obj === null || typeof obj !== 'object') {
+    return obj;
+  }
+  const hit = cache.filter(c => c.original === obj)[0];
+  if (hit) {
+    return hit.copy;
+  }
+  const copy = Array.isArray(obj) ? [] : {};
+  cache.push({
+    original: obj,
+    copy
+  });
+
+  Object.keys(obj).forEach((key) => {
+    copy[key] = deepCopy(obj[key], cache);
+  });
+
+  return copy;
+};
diff --git a/test/browser/browser.test.js b/test/browser/browser.test.js
index bb1c3314c..5f4cec821 100644
--- a/test/browser/browser.test.js
+++ b/test/browser/browser.test.js
@@ -960,6 +960,18 @@ describe('browser', () => {
         assert.equal(result.res.headers['x-oss-server-side-encryption'], 'AES256');
       });
 
+      it('should multipartUpload with x-oss-server-side-encryption', async () => {
+        const name = 'multipart-x-oss-server-side-encryption';
+        const fileContent = Array(1034 * 1024).fill('a').join('');
+        const fileName = new File([fileContent], 'multipart-upload-kms');
+        const result = await store.multipartUpload(name, fileName, {
+          headers: {
+            'x-oss-server-side-encryption': 'KMS'
+          }
+        });
+        assert.equal(result.res.headers['x-oss-server-side-encryption'], 'KMS');
+      });
+
       it('should fallback to putStream when file size is smaller than 100KB', async () => {
         const file = new File(['multipart-fallback-test'], 'multipart-fallback');
         const name = `${prefix}multipart/fallback`;
diff --git a/test/node/multipart.test.js b/test/node/multipart.test.js
index d51b9ee0d..8117abcda 100644
--- a/test/node/multipart.test.js
+++ b/test/node/multipart.test.js
@@ -157,6 +157,20 @@ describe('test/multipart.test.js', () => {
       assert.equal(result.res.headers['x-oss-server-side-encryption'], 'AES256');
     });
 
+    it('should multipartUpload with x-oss-server-side-encryption', async () => {
+      const name = 'multipart-x-oss-server-side-encryption';
+      const fileName = await utils.createTempFile(
+        'multipart-fallback',
+        1003 * 1020
+      );
+      const result = await store.multipartUpload(name, fileName, {
+        headers: {
+          'x-oss-server-side-encryption': 'KMS'
+        }
+      });
+      assert.equal(result.res.headers['x-oss-server-side-encryption'], 'KMS');
+    });
+
     it('should fallback to putStream when file size is smaller than 100KB', async () => {
       const fileName = await utils.createTempFile('multipart-fallback', (100 * 1024) - 1);
       const name = `${prefix}multipart/fallback`;