diff --git a/doc/Serving_Configure_CN.md b/doc/Serving_Configure_CN.md
index ca68bcf52cc7559d2cfa3ae00f9bfc29cd39295e..06407e4280f326ec52d7c8f7fd598f0cf266c17f 100644
--- a/doc/Serving_Configure_CN.md
+++ b/doc/Serving_Configure_CN.md
@@ -366,8 +366,13 @@ op:
             #use_mkldnn
             #use_mkldnn: True
 
-            #ir_optim
+            #ir_optim, 开启TensorRT时，必须同时设置ir_optim=True，否则无效
             ir_optim: True
+            
+            #precsion, 预测精度，降低预测精度可提升预测速度
+            #GPU 支持: "fp32"(default), "fp16", "int8"；
+            #CPU 支持: "fp32"(default), "fp16", "bf16"(mkldnn); 不支持: "int8"
+            precision: "fp32"
     rec:
         #并发数，is_thread_op=True时，为线程并发；否则为进程并发
         concurrency: 3