diff --git a/paddle/fluid/prim/api/manual_prim/static_prim_api.cc b/paddle/fluid/prim/api/manual_prim/static_prim_api.cc
index 01e0f4a10ebf821c72b3751ecfd723a7ab7f244b..54f419e4a9f17cfe9127c2c49741a2c23eeebe57 100644
--- a/paddle/fluid/prim/api/manual_prim/static_prim_api.cc
+++ b/paddle/fluid/prim/api/manual_prim/static_prim_api.cc
@@ -76,9 +76,12 @@ Tensor full<DescTensor>(const IntArray& shape,
     case phi::DataType::FLOAT32:
       op->SetAttr("value", value.to<float>());
       break;
-    case phi::DataType::FLOAT64:
-      op->SetAttr("str_value", std::to_string(value.to<double>()));
+    case phi::DataType::FLOAT64: {
+      std::stringstream ss;
+      ss << std::setprecision(20) << value.to<double>();
+      op->SetAttr("str_value", ss.str());
       break;
+    }
     case phi::DataType::BOOL:
       op->SetAttr("str_value", std::to_string(value.to<bool>()));
       break;