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diff --git a/_sidebar.md b/_sidebar.md
index 5681bb9..2a29f6e 100644
--- a/_sidebar.md
+++ b/_sidebar.md
@@ -19,6 +19,7 @@
   - [事件上报](features/udf.md)
   - [事务上报](features/transaction.md)
 - [**API Specs**](api/spec.md)
+- [**日志搜索语法**](settings/search-syntax.md)
 - [**设置**](settings/settings.md)
   - [用户管理](settings/users.md)
 - **更多**
diff --git a/features/cdn.md b/features/cdn.md
index 4ad5df7..bd74b99 100644
--- a/features/cdn.md
+++ b/features/cdn.md
@@ -20,4 +20,29 @@
 ![image](../_media/cdn_day_active_1.png)
 ![image](../_media/cdn_day_active_2.png)
 
+### 质量分析
+![image](../_media/cdn_quality_1.png)
+![image](../_media/cdn_quality_2.png)
+![image](../_media/cdn_quality_3.png)
+![image](../_media/cdn_quality_4.png)
+![image](../_media/cdn_quality_5.png)
+![image](../_media/cdn_quality_6.png)
+![image](../_media/cdn_quality_7.png)
+响应时间、响应速度可以进行下钻。点击柱状图展示散点图。点击具体的一个点可以查看原始日志。
+![image](../_media/cdn_quality_8.png)
+![image](../_media/cdn_quality_9.png)
+
+
+### 路径分析
+显示 PATH 的访问数据以及流量排序。点击 PATH 可以查看原始日志。
+![image](../_media/cdn_path_1.png)
+
+### 查询
+查询原始日志，搜索使用的是 ES 语法，例如：A:B AND C:D
+![image](../_media/cdn_log.png)
+
+### 实时 CDN 刷新分析
+![image](../_media/real_cdn_refresh.png)
+
+
 更多的展示维度正在酝酿中，敬请期待。
\ No newline at end of file
diff --git a/settings/search-syntax.md b/settings/search-syntax.md
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+++ b/settings/search-syntax.md
@@ -0,0 +1,55 @@
+### 搜索语法
+
+### 使用 lucene 语法搜索
+##### 条件编写规范
+| 名称 | 语义 |
+| - | - |
+| * | 查询所有内容 |
+| AND | query1 AND query2，查询交集 |
+| OR | query1 OR query2，查询并集 |
+| NOT | query1 AND NOT query2，表示符合query1，不符合query2的结果 |
+| () | 把一个或多个query合并成一个query，提升优先级 |
+| [] | 区间查询，包括边界，如 `status:[400 TO 500]` 查询 `status` 字段在 400 到 500 区间内的数据 |
+| {} | 区间查询，不包括边界，如 `status:{400 TO 500}` 查询 `status` 字段在 400 到 500 区间内的数据，并排除边界值 |
+| \ | 转义字符，如正则表达式搜索时表达式包含反斜杠的情况，如 `request_path:/\/query\/abc\/.*/` 查询 `request_path` 字段匹配正则表达式 `/path/abc/.* `的数据 |
+| >,=,<,<=,>= | 区间查询，如 `status:>=500` 查询 `status` 大于 500 的数据 |
+
+##### 查询举例
+字段名称`name`，类型`string`，包含内容`a`的记录：
+>``
+name:a
+``
+
+字段名称`ip`，类型`string`，包含内容`a`或`b`的记录：
+>``
+ip:a OR ip:b
+``
+
+字段名称`hosts`，类型`string`，包含内容`a`或者`b`,不包含`c`的记录：
+>``
+(hosts:a OR hosts:b) AND (NOT hosts:c)
+``
+
+字段名称`ip`，类型`string`，包含内容`a`或`b`，同时字段名称`hosts`，类型`string`，包含内容`c`的记录：
+>``
+(ip:a OR ip:b) AND (hosts:c)
+``
+
+字段名称`createTime`，类型`date`，包含内容`2018-10-01`到`2018-10-02`的记录：
+>``
+createTime:[2018-10-01 TO 2018-10-02]
+``
+
+字段名称`count`，类型`long`或者`float`，内容大于`5`的记录：
+>``
+count:>5
+``
+
+
+
+
+
+
+
+
+