diff --git a/paddle/fluid/operators/conv_op.h b/paddle/fluid/operators/conv_op.h
index 925603dad9ba3bd06186e6d9b8fa637f06c77b2f..7752fb6c4e3d101653b5fbb415698369184101e6 100644
--- a/paddle/fluid/operators/conv_op.h
+++ b/paddle/fluid/operators/conv_op.h
@@ -30,10 +30,6 @@ namespace paddle {
 namespace operators {
 
 using Tensor = phi::DenseTensor;
-constexpr int kConvMKLDNNFP32 = 1;
-constexpr int kConvMKLDNNINT8 = 2;
-constexpr int kConvMKLDNNINT8WS8 = 3;
-constexpr int MaxKeyLength = 256;
 
 // Base convolution operator definations for other conv
 // like operators to reuse the implementation.