diff --git a/test/encoder/EncUT_EncoderExt.cpp b/test/encoder/EncUT_EncoderExt.cpp
new file mode 100644
index 00000000..42458991
--- /dev/null
+++ b/test/encoder/EncUT_EncoderExt.cpp
@@ -0,0 +1,118 @@
+#include<gtest/gtest.h>
+#include<stdlib.h>
+#include "codec_api.h"
+#include "welsEncoderExt.h"
+
+using namespace WelsSVCEnc;
+
+class EncoderInterfaceTest : public ::testing::Test {
+ public:
+  virtual void SetUp() {
+    pPtrEnc = new CWelsH264SVCEncoder();
+    pParamExt = new SEncParamExt();
+    pSrcPic = new SSourcePicture;
+    pOption = new SEncParamExt();
+    pYUV = NULL;
+
+    m_iWidth = 1280;
+    m_iHeight = 720;
+    m_iPicResSize =  m_iWidth * m_iHeight * 3 >> 1;
+    pYUV = new uint8_t [m_iPicResSize];
+  }
+  void TemporalLayerSettingTest();
+  virtual void TearDown() {
+    delete pPtrEnc;
+    delete pParamExt;
+    delete pOption;
+    delete pSrcPic;
+    delete []pYUV;
+  }
+ public:
+  CWelsH264SVCEncoder* pPtrEnc;
+  SEncParamExt* pParamExt;
+  SSourcePicture* pSrcPic;
+  SEncParamExt* pOption;
+  uint8_t* pYUV;
+
+  int32_t m_iWidth;
+  int32_t m_iHeight;
+  int32_t m_iPicResSize;
+};
+
+void EncoderInterfaceTest::TemporalLayerSettingTest() {
+
+  pParamExt->iInputCsp = 23;
+  pParamExt->iPicWidth = m_iWidth;
+  pParamExt->iPicHeight = m_iHeight;
+  pParamExt->iTargetBitrate = 60000;
+  pParamExt->sSpatialLayers[0].iVideoHeight = pParamExt->iPicHeight;
+  pParamExt->sSpatialLayers[0].iVideoWidth = pParamExt->iPicWidth;
+  pParamExt->sSpatialLayers[0].iSpatialBitrate = 50000;
+  pParamExt->iTemporalLayerNum = 1;
+  pParamExt->iSpatialLayerNum = 1;
+
+  int32_t iResult = pPtrEnc->InitializeExt (pParamExt);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+
+  pSrcPic->iColorFormat = videoFormatI420;
+  pSrcPic->uiTimeStamp = 0;
+  pSrcPic->iPicWidth = pParamExt->iPicWidth;
+  pSrcPic->iPicHeight = pParamExt->iPicHeight;
+
+  for (int32_t i = 0; i < m_iPicResSize; i++)
+    pYUV[i] = rand() % 256;
+
+  pSrcPic->iStride[0] = m_iWidth;
+  pSrcPic->iStride[1] = pSrcPic->iStride[2] = pSrcPic->iStride[0] >> 1;
+
+  pSrcPic->pData[0] = pYUV;
+  pSrcPic->pData[1] = pSrcPic->pData[0] + (m_iWidth * m_iHeight);
+  pSrcPic->pData[2] = pSrcPic->pData[1] + (m_iWidth * m_iHeight >> 2);
+
+  SFrameBSInfo sFbi;
+  memset (&sFbi, 0, sizeof (SFrameBSInfo));
+
+  iResult = pPtrEnc->EncodeFrame (pSrcPic, &sFbi);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  EXPECT_EQ (sFbi.eFrameType, static_cast<int32_t> (videoFrameTypeIDR));
+
+  pSrcPic->uiTimeStamp = 30;
+  iResult = pPtrEnc->EncodeFrame (pSrcPic, &sFbi);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  EXPECT_EQ (sFbi.eFrameType, static_cast<int32_t> (videoFrameTypeP));
+
+  memcpy (pOption, pParamExt, sizeof (SEncParamExt));
+  pOption ->iTemporalLayerNum = 4;
+
+  ENCODER_OPTION eOptionId = ENCODER_OPTION_SVC_ENCODE_PARAM_EXT;
+  iResult = pPtrEnc->SetOption (eOptionId, pOption);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+
+  pSrcPic->uiTimeStamp = 60;
+  iResult = pPtrEnc->EncodeFrame (pSrcPic, &sFbi);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  EXPECT_EQ (sFbi.eFrameType, static_cast<int32_t> (videoFrameTypeIDR));
+
+  pOption ->iTemporalLayerNum = 2;
+  iResult = pPtrEnc->SetOption (eOptionId, pOption);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  pSrcPic->uiTimeStamp = 90;
+  iResult = pPtrEnc->EncodeFrame (pSrcPic, &sFbi);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  EXPECT_EQ (sFbi.eFrameType, static_cast<int32_t> (videoFrameTypeP));
+
+  pOption ->iTemporalLayerNum = 4;
+  iResult = pPtrEnc->SetOption (eOptionId, pOption);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  pSrcPic->uiTimeStamp = 120;
+  iResult = pPtrEnc->EncodeFrame (pSrcPic, &sFbi);
+  EXPECT_EQ (iResult, static_cast<int32_t> (cmResultSuccess));
+  EXPECT_EQ (sFbi.eFrameType, static_cast<int32_t> (videoFrameTypeP));
+
+  pPtrEnc->Uninitialize();
+
+}
+
+TEST_F (EncoderInterfaceTest, TestTemporalLayerSetting) {
+  TemporalLayerSettingTest();
+}
\ No newline at end of file
diff --git a/test/encoder/targets.mk b/test/encoder/targets.mk
index 60abdc4a..341558d1 100644
--- a/test/encoder/targets.mk
+++ b/test/encoder/targets.mk
@@ -1,6 +1,7 @@
 ENCODER_UNITTEST_SRCDIR=test/encoder
 ENCODER_UNITTEST_CPP_SRCS=\
 	$(ENCODER_UNITTEST_SRCDIR)/EncUT_DecodeMbAux.cpp\
+	$(ENCODER_UNITTEST_SRCDIR)/EncUT_EncoderExt.cpp\
 	$(ENCODER_UNITTEST_SRCDIR)/EncUT_EncoderMb.cpp\
 	$(ENCODER_UNITTEST_SRCDIR)/EncUT_EncoderMbAux.cpp\
 	$(ENCODER_UNITTEST_SRCDIR)/EncUT_ExpGolomb.cpp\