diff --git a/base/include/flat_obj.h b/base/include/flat_obj.h
index 0af092e..0c7dd7c 100644
--- a/base/include/flat_obj.h
+++ b/base/include/flat_obj.h
@@ -40,13 +40,4 @@ struct parcel_flat_binder_object {
     binder_uintptr_t cookie;
 };
 
-#ifndef B_PACK_CHARS
-#define B_PACK_CHARS(c1, c2, c3, c4) ((((c1) << 24)) | (((c2) << 16)) | (((c3) << 8)) | (c4))
-#endif
-
-#ifndef B_TYPE_LARGE
-#define B_TYPE_LARGE 0x85
-#endif
-
-#define PARCEL_BINDER_TYPE_FD B_PACK_CHARS('f', 'd', '*', B_TYPE_LARGE)
 #endif
diff --git a/base/include/parcel.h b/base/include/parcel.h
index b72c57d..a011996 100644
--- a/base/include/parcel.h
+++ b/base/include/parcel.h
@@ -297,7 +297,10 @@ public:
     bool ReadInt16Unaligned(int16_t &value);
     bool ReadUint8Unaligned(uint8_t &value);
     bool ReadUint16Unaligned(uint16_t &value);
-    bool ParcelAppend(Parcel &data);
+
+protected:
+    bool WriteObjectOffset(binder_size_t offset);
+    bool EnsureObjectsCapacity();
 
 private:
     DISALLOW_COPY_AND_MOVE(Parcel);
@@ -319,8 +322,6 @@ private:
         return (((size + SIZE_OFFSET) & (~SIZE_OFFSET)) - size);
     }
 
-    bool WriteObjectOffset(binder_size_t offset);
-
     size_t CalcNewCapacity(size_t minCapacity);
 
     bool WriteDataBytes(const void *data, size_t size);
@@ -329,8 +330,6 @@ private:
 
     bool EnsureWritableCapacity(size_t desireCapacity);
 
-    bool EnsureObjectsCapacity();
-
     bool WriteParcelableOffset(size_t offset);
 
 private:
diff --git a/base/src/parcel.cpp b/base/src/parcel.cpp
index 0eddc97..c3b6a98 100644
--- a/base/src/parcel.cpp
+++ b/base/src/parcel.cpp
@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include <unistd.h>
 
 #include "parcel.h"
 #include "securec.h"
@@ -1397,44 +1396,4 @@ bool Parcel::ReadString16Vector(std::vector<std::u16string> *val)
 
     return true;
 }
-
-bool Parcel::ParcelAppend(Parcel &data)
-{
-    size_t dataSize = data.GetDataSize();
-    if (dataSize == 0) {
-        return true;
-    }
-    uintptr_t dataPtr = data.GetData();
-    size_t writeCursorOld = writeCursor_;
-
-    if (EnsureWritableCapacity(dataSize)) {
-        if (!WriteDataBytes(reinterpret_cast<void *>(dataPtr), dataSize)) {
-            UTILS_LOGE("Failed to append data whit WriteBuffer");
-            return false;
-        }
-    }
-    size_t objectSize = data.GetOffsetsSize();
-    if (objectSize == 0) {
-        return true;
-    }
-    binder_size_t objectOffsets = data.GetObjectOffsets();
-    auto *newObjectOffsets = reinterpret_cast<binder_size_t *>(objectOffsets);
-    for (size_t index = 0; index < objectSize; index++) {
-        if (EnsureObjectsCapacity()) {
-            size_t offset = writeCursorOld + newObjectOffsets[index];
-            if (!WriteObjectOffset(offset)) {
-                UTILS_LOGE("Failed to write object offset");
-                return false;
-            }
-            parcel_flat_binder_object *flat = reinterpret_cast<parcel_flat_binder_object *>(data_ + offset);
-            if (flat->hdr.type == PARCEL_BINDER_TYPE_FD) {
-                flat->handle = dup(flat->handle);
-            }
-        } else {
-            UTILS_LOGE("Failed to ensure object capacity");
-            return false;
-        }
-    }
-    return true;
-}
 }  // namespace OHOS
diff --git a/base/test/unittest/common/utils_parcel_test.cpp b/base/test/unittest/common/utils_parcel_test.cpp
index 88185f4..63fe2ee 100644
--- a/base/test/unittest/common/utils_parcel_test.cpp
+++ b/base/test/unittest/common/utils_parcel_test.cpp
@@ -967,40 +967,3 @@ HWTEST_F(UtilsParcelTest, test_SetMaxCapacity_002, TestSize.Level0)
     ret = parcel.ReadString16Vector(&val);
     EXPECT_EQ(false, ret);
 }
-
-/**
- * @tc.name: test_ParcelAppend
- * @tc.desc: test parcel append function.
- * @tc.type: FUNC
- */
-HWTEST_F(UtilsParcelTest, test_ParcelAppend, TestSize.Level0)
-{
-    Parcel dstParcel, srcParcel;
-    bool res = dstParcel.ParcelAppend(srcParcel);
-    ASSERT_TRUE(res);
-
-    const int32_t num = 5767168;
-    const std::string strwrite1 =
-        "test for write string padded**********************************************************##################";
-    dstParcel.WriteInt32(num);
-    dstParcel.WriteString(strwrite1);
-    srcParcel.WriteInt32(num);
-    srcParcel.WriteString(strwrite1);
-    srcParcel.WriteString(strwrite1);
-
-    res = dstParcel.ParcelAppend(srcParcel);
-    ASSERT_TRUE(res);
-    EXPECT_EQ(num, dstParcel.ReadInt32());
-    EXPECT_EQ(strwrite1, dstParcel.ReadString());
-    EXPECT_EQ(num, dstParcel.ReadInt32());
-    EXPECT_EQ(strwrite1, dstParcel.ReadString());
-    EXPECT_EQ(strwrite1, dstParcel.ReadString());
-
-    res = srcParcel.ParcelAppend(dstParcel);
-    ASSERT_TRUE(res);
-    EXPECT_EQ(num, srcParcel.ReadInt32());
-    EXPECT_EQ(strwrite1, srcParcel.ReadString());
-    EXPECT_EQ(strwrite1, srcParcel.ReadString());
-    EXPECT_EQ(num, srcParcel.ReadInt32());
-    EXPECT_EQ(strwrite1, srcParcel.ReadString());
-}
\ No newline at end of file