diff --git a/dnn/src/cuda/conv_bias/algo.cpp b/dnn/src/cuda/conv_bias/algo.cpp
index 8614b790..0d773930 100644
--- a/dnn/src/cuda/conv_bias/algo.cpp
+++ b/dnn/src/cuda/conv_bias/algo.cpp
@@ -166,11 +166,12 @@ std::string ConvBiasForwardImpl::AlgoBase::SizeArgs::to_string() const {
             megdnn_throw("invalid conv bias nonlinear mode");
     }
     return megdnn_mangle(ssprintf(
-            "src=%s, filter=%u{%u,%u,%u,%u}, dst=%s, "
+            "src=%s, filter=%u{%u,%u,%u,%u}, bias=%s, z=%s, dst=%s, "
             "pad=%ux%u, stride=%ux%u, dilate=%ux%u, xcorr=%d, dtype=%s,%s, "
             "nonlinear_mode=%s",
             src_layout->to_string().c_str(), fm.group, fm.ocpg, fm.icpg,
-            fm.spatial[0], fm.spatial[1], dst_layout->to_string().c_str(),
+            fm.spatial[0], fm.spatial[1], bias_layout->to_string().c_str(),
+            z_layout->to_string().c_str(), dst_layout->to_string().c_str(),
             fm.padding[0], fm.padding[1], fm.stride[0], fm.stride[1],
             fm.dilation[0], fm.dilation[1], !fm.should_flip,
             src_layout->dtype.name(), dst_layout->dtype.name(),
diff --git a/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp b/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp
index 19c82aa8..a0980c1e 100644
--- a/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp
+++ b/dnn/src/cuda/conv_bias/cudnn_conv_bias_activation.cpp
@@ -27,9 +27,12 @@ bool ConvBiasForwardImpl::AlgoCUDNNConvBiasActivation::is_available(
         args.src_layout->dtype == dtype::BFloat16()) {
         return false;
     }
+
     if (args.bias_layout->ndim == 0 ||
-        args.bias_layout->eq_shape(*args.dst_layout))
+        !conv_bias::check_bias_share_in_channel(*(args.bias_layout),
+                                                args.opr->param().format)) {
         return false;
+    }
     auto&& param = args.opr->param();
     if (param.format == param::ConvBias::Format::NCHW4_NCHW32 ||
         param.format == param::ConvBias::Format::NCHW32_NCHW4)