diff --git a/codec/decoder/core/src/mc.cpp b/codec/decoder/core/src/mc.cpp
index e0c5d84b..bcc166be 100644
--- a/codec/decoder/core/src/mc.cpp
+++ b/codec/decoder/core/src/mc.cpp
@@ -892,7 +892,7 @@ void McHorVer33_neon (const uint8_t* pSrc, int32_t iSrcStride, uint8_t* pDst, in
 
 void McLuma_neon (const uint8_t* pSrc, int32_t iSrcStride, uint8_t* pDst, int32_t iDstStride,
                   int16_t iMvX, int16_t iMvY, int32_t iWidth, int32_t iHeight) {
-  static PWelsMcWidthHeightFunc pWelsMcFunc[4][4] = { //[x][y]
+  static const PWelsMcWidthHeightFunc pWelsMcFunc[4][4] = { //[x][y]
     {McCopy_neon,  McHorVer01_neon, McHorVer02_neon,    McHorVer03_neon},
     {McHorVer10_neon, McHorVer11_neon, McHorVer12_neon, McHorVer13_neon},
     {McHorVer20_neon,    McHorVer21_neon, McHorVer22_neon,    McHorVer23_neon},
@@ -1143,7 +1143,7 @@ void McHorVer33_AArch64_neon (const uint8_t* pSrc, int32_t iSrcStride, uint8_t*
 
 void McLuma_AArch64_neon (const uint8_t* pSrc, int32_t iSrcStride, uint8_t* pDst, int32_t iDstStride,
                           int16_t iMvX, int16_t iMvY, int32_t iWidth, int32_t iHeight) {
-  static PWelsMcWidthHeightFunc pWelsMcFunc[4][4] = { //[x][y]
+  static const PWelsMcWidthHeightFunc pWelsMcFunc[4][4] = { //[x][y]
     {McCopy_AArch64_neon,  McHorVer01_AArch64_neon, McHorVer02_AArch64_neon,    McHorVer03_AArch64_neon},
     {McHorVer10_AArch64_neon, McHorVer11_AArch64_neon, McHorVer12_AArch64_neon, McHorVer13_AArch64_neon},
     {McHorVer20_AArch64_neon,    McHorVer21_AArch64_neon, McHorVer22_AArch64_neon,    McHorVer23_AArch64_neon},
diff --git a/codec/encoder/core/src/md.cpp b/codec/encoder/core/src/md.cpp
index 6eaf8ea4..334c51c2 100644
--- a/codec/encoder/core/src/md.cpp
+++ b/codec/encoder/core/src/md.cpp
@@ -590,8 +590,8 @@ void MeRefineFracPixel (sWelsEncCtx* pEncCtx, uint8_t* pMemPredInterMb, SWelsME*
   int32_t iBestQuarPix = ME_NO_BEST_QUAR_PIXEL;
 
   SQuarRefineParams sParams;
-  static int32_t iMvQuarAddX[10] = {0, 0, -1, 1, 0, 0, 0, -1, 1, 0};
-  int32_t* pMvQuarAddY = iMvQuarAddX + 3;
+  static const int32_t iMvQuarAddX[10] = {0, 0, -1, 1, 0, 0, 0, -1, 1, 0};
+  const int32_t* pMvQuarAddY = iMvQuarAddX + 3;
   uint8_t* pBestPredInter = pRef;
   int32_t iInterBlk4Stride = ME_REFINE_BUF_STRIDE;
 
diff --git a/codec/encoder/core/src/svc_encode_slice.cpp b/codec/encoder/core/src/svc_encode_slice.cpp
index 78a87781..398966e0 100644
--- a/codec/encoder/core/src/svc_encode_slice.cpp
+++ b/codec/encoder/core/src/svc_encode_slice.cpp
@@ -697,11 +697,11 @@ int32_t WelsCodePOverDynamicSlice (sWelsEncCtx* pEncCtx, SSlice* pSlice) {
 
 // 1st index: 0: for P pSlice; 1: for I pSlice;
 // 2nd index: 0: for non-dynamic pSlice; 1: for dynamic I pSlice;
-PWelsCodingSliceFunc	g_pWelsSliceCoding[2][2] = {
+static const PWelsCodingSliceFunc	g_pWelsSliceCoding[2][2] = {
   { WelsCodePSlice, WelsCodePOverDynamicSlice },	// P SSlice
   { WelsISliceMdEnc, WelsISliceMdEncDynamic }	// I SSlice
 };
-PWelsSliceHeaderWriteFunc		g_pWelsWriteSliceHeader[2] = {	// 0: for base; 1: for ext;
+static const PWelsSliceHeaderWriteFunc		g_pWelsWriteSliceHeader[2] = {	// 0: for base; 1: for ext;
   WelsSliceHeaderWrite,
   WelsSliceHeaderExtWrite
 };