diff --git a/CHANGELOG.md b/CHANGELOG.md
index abbed24..7234427 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,11 @@
 
 > please add your unreleased change here.
 
+## 20240524 - 0.3.1b0
+
+- [Bugfix] fix tree predict base score miss
+- [Bugfix] fix http adapater error msg format failed
+
 ## 20240423 - 0.3.0b0
 
 - [Feature] Add Trace function
diff --git a/secretflow_serving/feature_adapter/http_adapter.cc b/secretflow_serving/feature_adapter/http_adapter.cc
index a5c379d..c077026 100644
--- a/secretflow_serving/feature_adapter/http_adapter.cc
+++ b/secretflow_serving/feature_adapter/http_adapter.cc
@@ -147,7 +147,7 @@ void HttpFeatureAdapter::OnFetchFeature(const Request& request,
   SetSpanAttrs(span, span_option);
 
   SERVING_ENFORCE(span_option.code == errors::ErrorCode::OK, span_option.code,
-                  span_option.msg);
+                  "{}", span_option.msg);
   response->header->mutable_data()->swap(
       *spi_response.mutable_header()->mutable_data());
   response->features =
diff --git a/secretflow_serving/framework/execute_context.cc b/secretflow_serving/framework/execute_context.cc
index e221b9d..87e3675 100644
--- a/secretflow_serving/framework/execute_context.cc
+++ b/secretflow_serving/framework/execute_context.cc
@@ -26,10 +26,9 @@ void ExecuteContext::CheckAndUpdateResponse() {
 void ExecuteContext::CheckAndUpdateResponse(
     const apis::ExecuteResponse& exec_res) {
   if (!CheckStatusOk(exec_res.status())) {
-    SERVING_THROW(
-        exec_res.status().code(),
-        fmt::format("{} exec failed: code({}), {}", target_id_,
-                    exec_res.status().code(), exec_res.status().msg()));
+    SERVING_THROW(exec_res.status().code(), "{} exec failed: code({}), {}",
+                  target_id_, exec_res.status().code(),
+                  exec_res.status().msg());
   }
   MergeResonseHeader(exec_res);
 }
diff --git a/secretflow_serving/framework/execute_context.h b/secretflow_serving/framework/execute_context.h
index 8150670..adbcb55 100644
--- a/secretflow_serving/framework/execute_context.h
+++ b/secretflow_serving/framework/execute_context.h
@@ -209,7 +209,7 @@ class RemoteExecute : public ExecuteBase,
     if (span_option.code == errors::ErrorCode::OK) {
       exec_ctx_.MergeResonseHeader();
     } else {
-      SERVING_THROW(span_option.code, span_option.msg);
+      SERVING_THROW(span_option.code, "{}", span_option.msg);
     }
   }
 
diff --git a/secretflow_serving/ops/tree_ensemble_predict.cc b/secretflow_serving/ops/tree_ensemble_predict.cc
index be32b57..0ec1c15 100644
--- a/secretflow_serving/ops/tree_ensemble_predict.cc
+++ b/secretflow_serving/ops/tree_ensemble_predict.cc
@@ -40,6 +40,9 @@ TreeEnsemblePredict::TreeEnsemblePredict(OpKernelOptions opts)
       GetNodeAttr<std::string>(opts_.node_def, *opts_.op_def, "algo_func");
   func_type_ = ParseLinkFuncType(func_type_str);
 
+  base_score_ =
+      GetNodeAttr<double>(opts_.node_def, *opts_.op_def, "base_score");
+
   BuildInputSchema();
   BuildOutputSchema();
 }
@@ -65,7 +68,8 @@ void TreeEnsemblePredict::DoCompute(ComputeContext* ctx) {
   arrow::DoubleBuilder builder;
   SERVING_CHECK_ARROW_STATUS(builder.Resize(merged_array->length()));
   for (int64_t i = 0; i < merged_array->length(); ++i) {
-    auto score = ApplyLinkFunc(merged_array->Value(i), func_type_);
+    auto score = merged_array->Value(i) + base_score_;
+    score = ApplyLinkFunc(score, func_type_);
     SERVING_CHECK_ARROW_STATUS(builder.Append(score));
   }
   std::shared_ptr<arrow::Array> res_array;
@@ -90,7 +94,7 @@ void TreeEnsemblePredict::BuildOutputSchema() {
 }
 
 REGISTER_OP_KERNEL(TREE_ENSEMBLE_PREDICT, TreeEnsemblePredict)
-REGISTER_OP(TREE_ENSEMBLE_PREDICT, "0.0.1",
+REGISTER_OP(TREE_ENSEMBLE_PREDICT, "0.0.2",
             "Accept the weighted results from multiple trees (`TREE_SELECT` + "
             "`TREE_MERGE`), merge them, and obtain the final prediction result "
             "of the tree ensemble.")
@@ -101,6 +105,8 @@ REGISTER_OP(TREE_ENSEMBLE_PREDICT, "0.0.1",
     .StringAttr("output_col_name",
                 "The column name of tree ensemble predict score", false, false)
     .Int32Attr("num_trees", "The number of ensemble's tree", false, false)
+    .DoubleAttr("base_score", "The initial prediction score, global bias.",
+                false, true, 0.0)
     .StringAttr(
         "algo_func",
         "Optional value: "
diff --git a/secretflow_serving/ops/tree_ensemble_predict.h b/secretflow_serving/ops/tree_ensemble_predict.h
index 7d250f9..58f1b5a 100644
--- a/secretflow_serving/ops/tree_ensemble_predict.h
+++ b/secretflow_serving/ops/tree_ensemble_predict.h
@@ -37,6 +37,8 @@ class TreeEnsemblePredict : public OpKernel {
 
   int32_t num_trees_;
   LinkFunctionType func_type_;
+
+  double base_score_ = 0.0;
 };
 
 }  // namespace secretflow::serving::op
diff --git a/secretflow_serving/ops/tree_ensemble_predict_test.cc b/secretflow_serving/ops/tree_ensemble_predict_test.cc
index aef5b60..1adf4bf 100644
--- a/secretflow_serving/ops/tree_ensemble_predict_test.cc
+++ b/secretflow_serving/ops/tree_ensemble_predict_test.cc
@@ -47,6 +47,9 @@ TEST_P(TreeEnsemblePredictParamTest, Works) {
     },
     "output_col_name": {
       "s": "scores"
+    },
+    "base_score": {
+      "d": 0.1
     }
   }
 }
@@ -96,6 +99,7 @@ TEST_P(TreeEnsemblePredictParamTest, Works) {
     for (size_t col = 1; col < param.tree_weights.size(); ++col) {
       score += param.tree_weights[col][row];
     }
+    score += 0.1;
     SERVING_CHECK_ARROW_STATUS(expect_res_builder.Append(
         ApplyLinkFunc(score, ParseLinkFuncType(param.algo_func))));
   }
diff --git a/secretflow_serving_lib/version.py b/secretflow_serving_lib/version.py
index 482974b..ef51f6d 100644
--- a/secretflow_serving_lib/version.py
+++ b/secretflow_serving_lib/version.py
@@ -13,4 +13,4 @@
 # limitations under the License.
 
 
-__version__ = "0.3.0b0"
+__version__ = "0.3.1b0"
diff --git a/version.txt b/version.txt
index 482974b..ef51f6d 100644
--- a/version.txt
+++ b/version.txt
@@ -13,4 +13,4 @@
 # limitations under the License.
 
 
-__version__ = "0.3.0b0"
+__version__ = "0.3.1b0"