diff --git a/.vitepress/config.js b/.vitepress/config.js
index 53305231469a9a937c37f0e7d88f3339c7b34e13..9baef38a0cf25c703cfcc676b7fba8e7329ae85b 100644
--- a/.vitepress/config.js
+++ b/.vitepress/config.js
@@ -59,6 +59,9 @@ module.exports = {
             children: [{
                 text: '变量',
                 link: '/guide/vars',
+            },{
+                text: "表达式",
+                link: "/guide/expression"
             },
             //     {
             //     text: '网关',
diff --git a/guide/expression.md b/guide/expression.md
new file mode 100644
index 0000000000000000000000000000000000000000..f0163ca05af4e9bac39c0043373cc452a01f8d3f
--- /dev/null
+++ b/guide/expression.md
@@ -0,0 +1,67 @@
+# 表达式
+### 运算表达式
+* 运算表达式可在`流程/管道`定义中作为节点参数使用，平台会获取表达式的运算结果，作为参数值使用，如：
+```
+# xxx节点的输出参数: a = 1
+# xxx节点的输出参数: b = 2
+pipeline:
+  ssh_cmd:
+    type: ssh_cmd: 1.0.0
+    param:
+      ssh_cmd: ("echo " + (${xxx.a} + ${xxx.b}))
+      ssh_ip: 127.0.0.1
+      ssh_private_key: ((xxx.xxx))
+      ssh_user: root
+```
+* 引用方式：(xxx)
+```
+# xxx节点的输出参数: a = 1
+# xxx节点的输出参数: b = 2
+ssh_cmd: ("echo " + (${xxx.a} + ${xxx.b}))
+```
+等价于
+```
+ssh_cmd: echo 3
+```
+详情参见[建木表达式引擎](https://gitee.com/jianmu-dev/jianmu-el/tree/1.1/)
+
+### 字符串模版
+* 节点参数默认为字符串模版，如：
+
+```
+# 全局变量: image_name = jianmu-runner-hub
+# node_build节点的输出参数: package_name = jianmu_runner_hub
+# node_build节点的输出参数: package_version = 1.0.0
+pipeline:
+  image_build:
+    type: docker_image_build:1.0.0
+    param:
+      docker_file: Dockerfile
+      image_name: ${global.image_name}
+      image_tag: ${node_build.package_name}-${node_build.package_version}
+```
+* 引用方式
+1. 字符串：xxx
+```
+docker_file: Dockerfile
+```
+2. 变量：${xxx.xxx}
+
+```
+# 全局变量: image_name = jianmu-runner-hub
+image_name: ${global.image_name}
+```
+等价于
+```
+image_name: jianmu_runner_hub
+```
+3. 变量 + 字符串：${xxx.xxx}xxx${xxx.xxx}
+```
+# node_build节点的输出参数: package_name = jianmu_runner_hub
+# node_build节点的输出参数: package_version = 1.0.0
+image_tag: ${node_build.package_name}-${node_build.package_version}
+```
+等价于
+```
+image_tag: jianmu-runner-hub-1.0.0
+```