diff --git a/paddle/capi/Arguments.cpp b/paddle/capi/Arguments.cpp
index 678a80ac3f4d5ca5aa3321d0b089fe5a8c465af1..baabd44cc0c63caea6838ada9ea94e2b71876ea1 100644
--- a/paddle/capi/Arguments.cpp
+++ b/paddle/capi/Arguments.cpp
@@ -75,34 +75,66 @@ int PDArgsGetIds(PD_Arguments args, uint64_t ID, PD_IVector ids) {
 
 int PDArgsSetIds(PD_Arguments args, uint64_t ID, PD_IVector ids) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (args == nullptr || ids == nullptr) return kPD_NULLPTR;
+  auto iv = paddle::capi::cast<paddle::capi::CIVector>(ids);
+  if (iv->vec == nullptr) return kPD_NULLPTR;
+  auto a = castArg(args);
+  if (ID >= a->args.size()) return kPD_OUT_OF_RANGE;
+  a->args[ID].ids = iv->vec;
+  return kPD_NO_ERROR;
 }
 
 int PDArgsSetSequenceStartPos(PD_Arguments args,
                               uint64_t ID,
                               PD_IVector seqPos) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (args == nullptr || seqPos == nullptr) return kPD_NULLPTR;
+  auto iv = paddle::capi::cast<paddle::capi::CIVector>(seqPos);
+  if (iv->vec == nullptr) return kPD_NULLPTR;
+  auto a = castArg(args);
+  if (ID >= a->args.size()) return kPD_OUT_OF_RANGE;
+  a->args[ID].sequenceStartPositions =
+      std::make_shared<paddle::ICpuGpuVector>(iv->vec);
+  return kPD_NO_ERROR;
 }
 
 int PDArgsSetSubSequenceStartPos(PD_Arguments args,
                                  uint64_t ID,
                                  PD_IVector subSeqPos) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (args == nullptr || subSeqPos == nullptr) return kPD_NULLPTR;
+  auto iv = paddle::capi::cast<paddle::capi::CIVector>(subSeqPos);
+  if (iv->vec == nullptr) return kPD_NULLPTR;
+  auto a = castArg(args);
+  if (ID >= a->args.size()) return kPD_OUT_OF_RANGE;
+  a->args[ID].sequenceStartPositions =
+      std::make_shared<paddle::ICpuGpuVector>(iv->vec);
+  return kPD_NO_ERROR;
 }
 
 int PDArgsGetSequenceStartPos(PD_Arguments args,
                               uint64_t ID,
                               PD_IVector seqPos) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (args == nullptr || seqPos == nullptr) return kPD_NULLPTR;
+  auto iv = castIVec(seqPos);
+  auto a = castArg(args);
+  if (ID >= a->args.size()) return kPD_OUT_OF_RANGE;
+  std::make_shared<paddle::ICpuGpuVector>(iv->vec) =
+      a->args[ID].sequenceStartPositions;
+  return kPD_NO_ERROR;
 }
 
 int PDArgsGetSubSequenceStartPos(PD_Arguments args,
                                  uint64_t ID,
                                  PD_IVector subSeqPos) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (args == nullptr || subSeqPos == nullptr) return kPD_NULLPTR;
+  auto iv = castIVec(subSeqPos);
+  auto a = castArg(args);
+  if (ID >= a->args.size()) return kPD_OUT_OF_RANGE;
+  std::make_shared<paddle::ICpuGpuVector>(iv->vec) =
+      a->args[ID].sequenceStartPositions;
+  return kPD_NO_ERROR;
 }
 }
diff --git a/paddle/capi/Vector.cpp b/paddle/capi/Vector.cpp
index a2e6f3507de3d1fcc3693bf6fce42e8ed5991644..38a5fbc00a8bebd524816d8a39364d7ca0c196c8 100644
--- a/paddle/capi/Vector.cpp
+++ b/paddle/capi/Vector.cpp
@@ -28,7 +28,16 @@ int PDIVecCreateNone(PD_IVector* ivec) {
 
 int PDIVectorCreate(PD_IVector* ivec, int* array, uint64_t size, bool copy) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (ivec == nullptr) return kPD_NULLPTR;
+  auto ptr = new paddle::capi::CIVector();
+  if (copy) {
+    ptr->vec = paddle::IVector::create(size, false);
+    ptr->vec->copyFrom(array, size);
+  } else {
+    ptr->vec = paddle::IVector::create(array, size, false);
+  }
+  *ivec = ptr;
+  return kPD_NO_ERROR;
 }
 
 int PDIVecDestroy(PD_IVector ivec) {
@@ -47,11 +56,19 @@ int PDIVectorGet(PD_IVector ivec, int** buffer) {
 
 int PDIVectorResize(PD_IVector ivec, uint64_t size) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (ivec == nullptr) return kPD_NULLPTR;
+  auto v = cast<paddle::capi::CIVector>(ivec);
+  if (v->vec == nullptr) return kPD_NULLPTR;
+  v->vec->resize(size);
+  return kPD_NO_ERROR;
 }
 
 int PDIVectorGetSize(PD_IVector ivec, uint64_t* size) {
   //! TODO(lizhao): Complete this method.
-  return kPD_UNDEFINED_ERROR;
+  if (ivec == nullptr) return kPD_NULLPTR;
+  auto v = cast<paddle::capi::CIVector>(ivec);
+  if (v->vec == nullptr) return kPD_NULLPTR;
+  *size = v->vec->getSize();
+  return kPD_NO_ERROR;
 }
 }
diff --git a/paddle/capi/tests/test_Arguments.cpp b/paddle/capi/tests/test_Arguments.cpp
index 4a18ffbf47413477ef4bc94af70a1a34e7471bf4..1186d2921ba463b9b7e4156e9985e458d52484b0 100644
--- a/paddle/capi/tests/test_Arguments.cpp
+++ b/paddle/capi/tests/test_Arguments.cpp
@@ -70,3 +70,39 @@ TEST(CAPIArguments, value) {
   ASSERT_EQ(kPD_NO_ERROR, PDMatDestroy(mat));
   ASSERT_EQ(kPD_NO_ERROR, PDArgsDestroy(args));
 }
+
+TEST(CAPIArguments, ids) {
+  PD_Arguments args;
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsCreateNone(&args));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsResize(args, 1));
+
+  PD_IVector ivec;
+  int array[3] = {1, 2, 3};
+  ASSERT_EQ(kPD_NO_ERROR, PDIVectorCreate(&ivec, array, 3, true));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsSetIds(args, 0, ivec));
+
+  PD_IVector val;
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecCreateNone(&val));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsGetIds(args, 0, val));
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecDestroy(ivec));
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecDestroy(val));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsDestroy(args));
+}
+
+TEST(CAPIArguments, Sequence) {
+  PD_Arguments args;
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsCreateNone(&args));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsResize(args, 1));
+
+  PD_IVector ivec;
+  int array[3] = {1, 2, 3};
+  ASSERT_EQ(kPD_NO_ERROR, PDIVectorCreate(&ivec, array, 3, true));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsSetSequenceStartPos(args, 0, ivec));
+
+  PD_IVector val;
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecCreateNone(&val));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsGetSequenceStartPos(args, 0, val));
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecDestroy(ivec));
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecDestroy(val));
+  ASSERT_EQ(kPD_NO_ERROR, PDArgsDestroy(args));
+}
diff --git a/paddle/capi/tests/test_Vector.cpp b/paddle/capi/tests/test_Vector.cpp
index 2697e80b92c220897a17325b1e7549403ba85ba8..547d0ef20d16865b376ee80045c14a3002ee70d3 100644
--- a/paddle/capi/tests/test_Vector.cpp
+++ b/paddle/capi/tests/test_Vector.cpp
@@ -17,10 +17,17 @@ limitations under the License. */
 
 TEST(CAPIVector, create) {
   PD_IVector vec;
-  ASSERT_EQ(kPD_NO_ERROR, PDIVecCreateNone(&vec));
+  int array[3] = {1, 2, 3};
+  ASSERT_EQ(kPD_NO_ERROR, PDIVectorCreate(&vec, array, 3, true));
+  ASSERT_EQ(kPD_NO_ERROR, PDIVectorCreate(&vec, array, 3, false));
   ASSERT_EQ(kPD_NO_ERROR, PDIVectorResize(vec, 1000));
   uint64_t size;
   ASSERT_EQ(kPD_NO_ERROR, PDIVectorGetSize(vec, &size));
-  ASSERT_EQ(1000, size);
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecDestroy(vec));
+}
+
+TEST(CAPIVector, createNone) {
+  PD_IVector vec;
+  ASSERT_EQ(kPD_NO_ERROR, PDIVecCreateNone(&vec));
   ASSERT_EQ(kPD_NO_ERROR, PDIVecDestroy(vec));
 }