diff --git a/paddle/fluid/operators/detection/box_coder_op.cc b/paddle/fluid/operators/detection/box_coder_op.cc
index b4b02124ccd206cd604dcbea063bfe896eb3fd28..2ce844669bd0e0ec904971565bd66c83a79d353e 100644
--- a/paddle/fluid/operators/detection/box_coder_op.cc
+++ b/paddle/fluid/operators/detection/box_coder_op.cc
@@ -43,7 +43,7 @@ class BoxCoderOp : public framework::OperatorWithKernel {
         if (prior_box_var_dims.size() == 1) {
           PADDLE_ENFORCE_EQ(
               prior_box_var_dims[0], 4,
-              "The 1st dimension of Input(PriorBoxVar) should be 1"
+              "The 1st dimension of Input(PriorBoxVar) should be 4"
               "when the rank is 1.");
         } else {
           PADDLE_ENFORCE_EQ(
@@ -52,37 +52,36 @@ class BoxCoderOp : public framework::OperatorWithKernel {
               "the dimension of Input(PriorBox when the rank is 2.)");
         }
       }
+    }
 
-      auto code_type =
-          GetBoxCodeType(ctx->Attrs().Get<std::string>("code_type"));
-      int axis = ctx->Attrs().Get<int>("axis");
-      if (code_type == BoxCodeType::kEncodeCenterSize) {
-        PADDLE_ENFORCE_EQ(target_box_dims.size(), 2,
-                          "The rank of Input of TargetBox must be 2");
-        PADDLE_ENFORCE_EQ(target_box_dims[1], 4,
-                          "The shape of TargetBox is [M, 4]");
-        ctx->SetOutputDim(
-            "OutputBox",
-            framework::make_ddim({target_box_dims[0], prior_box_dims[0], 4}));
-      } else if (code_type == BoxCodeType::kDecodeCenterSize) {
-        PADDLE_ENFORCE_EQ(target_box_dims.size(), 3,
-                          "The rank of Input of TargetBox must be 3");
-        if (axis == 0) {
-          PADDLE_ENFORCE_EQ(target_box_dims[1], prior_box_dims[0]);
-        } else if (axis == 1) {
-          PADDLE_ENFORCE_EQ(target_box_dims[0], prior_box_dims[0]);
-        } else {
-          PADDLE_THROW("axis must be 0 or 1.");
-        }
-        PADDLE_ENFORCE_EQ(target_box_dims[2], prior_box_dims[1]);
-        ctx->ShareDim("TargetBox", /*->*/ "OutputBox");
-      }
-
-      if (code_type == BoxCodeType::kDecodeCenterSize && axis == 1) {
-        ctx->ShareLoD("PriorBox", /*->*/ "OutputBox");
+    auto code_type = GetBoxCodeType(ctx->Attrs().Get<std::string>("code_type"));
+    int axis = ctx->Attrs().Get<int>("axis");
+    if (code_type == BoxCodeType::kEncodeCenterSize) {
+      PADDLE_ENFORCE_EQ(target_box_dims.size(), 2,
+                        "The rank of Input of TargetBox must be 2");
+      PADDLE_ENFORCE_EQ(target_box_dims[1], 4,
+                        "The shape of TargetBox is [M, 4]");
+      ctx->SetOutputDim(
+          "OutputBox",
+          framework::make_ddim({target_box_dims[0], prior_box_dims[0], 4}));
+    } else if (code_type == BoxCodeType::kDecodeCenterSize) {
+      PADDLE_ENFORCE_EQ(target_box_dims.size(), 3,
+                        "The rank of Input of TargetBox must be 3");
+      if (axis == 0) {
+        PADDLE_ENFORCE_EQ(target_box_dims[1], prior_box_dims[0]);
+      } else if (axis == 1) {
+        PADDLE_ENFORCE_EQ(target_box_dims[0], prior_box_dims[0]);
       } else {
-        ctx->ShareLoD("TargetBox", /*->*/ "OutputBox");
+        PADDLE_THROW("axis must be 0 or 1.");
       }
+      PADDLE_ENFORCE_EQ(target_box_dims[2], prior_box_dims[1]);
+      ctx->ShareDim("TargetBox", /*->*/ "OutputBox");
+    }
+
+    if (code_type == BoxCodeType::kDecodeCenterSize && axis == 1) {
+      ctx->ShareLoD("PriorBox", /*->*/ "OutputBox");
+    } else {
+      ctx->ShareLoD("TargetBox", /*->*/ "OutputBox");
     }
   }
 };