diff --git a/codec/decoder/core/src/decoder.cpp b/codec/decoder/core/src/decoder.cpp
index ab616995..88e599d4 100644
--- a/codec/decoder/core/src/decoder.cpp
+++ b/codec/decoder/core/src/decoder.cpp
@@ -516,9 +516,11 @@ int32_t DecoderConfigParam (PWelsDecoderContext pCtx, const SDecodingParam* kpPa
 
   memcpy (pCtx->pParam, kpParam, sizeof (SDecodingParam));
   pCtx->eOutputColorFormat	= pCtx->pParam->eOutputColorFormat;
-  int32_t iRet = DecoderSetCsp (pCtx, pCtx->pParam->eOutputColorFormat);
-  if (iRet)
-    return iRet;
+  if (!pCtx->bParseOnly) {
+    int32_t iRet = DecoderSetCsp (pCtx, pCtx->pParam->eOutputColorFormat);
+    if (iRet)
+      return iRet;
+  }
   pCtx->eErrorConMethod = pCtx->pParam->eEcActiveIdc;
 
   if (pCtx->bParseOnly) //parse only, disable EC method
diff --git a/codec/decoder/plus/src/welsDecoderExt.cpp b/codec/decoder/plus/src/welsDecoderExt.cpp
index a93a418b..edbf058d 100644
--- a/codec/decoder/plus/src/welsDecoderExt.cpp
+++ b/codec/decoder/plus/src/welsDecoderExt.cpp
@@ -258,6 +258,11 @@ long CWelsDecoder::SetOption (DECODER_OPTION eOptID, void* pOption) {
     return dsInitialOptExpected;
 
   if (eOptID == DECODER_OPTION_DATAFORMAT) { // Set color space of decoding output frame
+    if (m_pDecContext->bParseOnly) {
+      WelsLog (&m_pWelsTrace->m_sLogCtx, WELS_LOG_WARNING,
+               "CWelsDecoder::SetOption for data format meaningless for parseonly.");
+      return cmResultSuccess;
+    }
     if (pOption == NULL)
       return cmInitParaError;
 
diff --git a/test/api/encode_decode_api_test.cpp b/test/api/encode_decode_api_test.cpp
index 17b27868..c13dead4 100644
--- a/test/api/encode_decode_api_test.cpp
+++ b/test/api/encode_decode_api_test.cpp
@@ -2337,7 +2337,7 @@ class DecodeParseAPI : public EncodeDecodeTestBase {
       decoder_->Uninitialize();
     SDecodingParam decParam;
     memset (&decParam, 0, sizeof (SDecodingParam));
-    decParam.eOutputColorFormat = videoFormatI420;
+    decParam.eOutputColorFormat = videoFormatRGB;
     decParam.uiTargetDqLayer = UCHAR_MAX;
     decParam.eEcActiveIdc = ERROR_CON_SLICE_COPY;
     decParam.bParseOnly = true;