diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..4a8bbb5
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,72 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "master" ]
+  schedule:
+    - cron: '40 14 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
+        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        
+        # Details on CodeQL's query packs refer to : https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+        # queries: security-extended,security-and-quality
+
+        
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v3
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+
+    #   If the Autobuild fails above, remove it and uncomment the following three lines. 
+    #   modify them (or add more) to build your code if your project, please refer to the EXAMPLE below for guidance.
+
+    # - run: |
+    #   echo "Run, Build Application using script"
+    #   ./location_of_script_within_repo/buildscript.sh
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
diff --git a/README.md b/README.md
index e5b60f8..75e548b 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,8 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/gookit/easytpl)](https://goreportcard.com/report/github.com/gookit/easytpl)
 [![Unit-Tests](https://github.com/gookit/easytpl/workflows/Unit-Tests/badge.svg)](https://github.com/gookit/easytpl/actions)
 
-A simple template renderer based on the `html/template`, but much simpler to use. Support layout rendering, including templates.
+A simple template renderer based on the Go `html/template`, but much simpler to use. 
+Support layout rendering, including templates.
 
 > **[中文说明](README.zh-CN.md)**
 
@@ -17,6 +18,8 @@ A simple template renderer based on the `html/template`, but much simpler to use
 - support layout render. 
   - eg `{{ include "header" }} {{ yield }} {{ include "footer" }}`
 - support include other templates. eg `{{ include "other" }}`
+- support `extends` base templates. eg `{{ extends "base.tpl" }}`
+- support custom template functions
 - built-in some helper methods `row`, `lower`, `upper`, `join` ...
 
 ## Godoc
@@ -80,7 +83,7 @@ func main()  {
 }
 ```
 
-> more APIS please [GoDoc](https://pkg.go.dev/github.com/gookit/easytpl) 
+> more APIs please [GoDoc](https://pkg.go.dev/github.com/gookit/easytpl) 
 
 ## Layout Example
 
@@ -140,7 +143,7 @@ templates/
 
 - `templates/home.tpl`
 
-```html
+```gotemplate title="home.tpl"
   <h1>Hello, {{ .Name | upper }}</h1>
   <h2>At template {{ current_tpl }}</h2>
   <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
@@ -149,7 +152,7 @@ templates/
 ### Usage
 
 ```go
-v := easytpl.NewInitialized(func(r *easytpl.Renderer) {
+v := easytpl.NewInited(func(r *easytpl.Renderer) {
     // setting default layout
     r.Layout = "layouts/default" // equals to "layouts/default.tpl"
     // templates dir. will auto load on init.
@@ -159,10 +162,74 @@ v := easytpl.NewInitialized(func(r *easytpl.Renderer) {
 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 	v.Render(w, "home", easytpl.M{"Name": "tom"})
 })
-log.Println("Listening port: 9100")
+slog.Println("Listening port: 9100")
 http.ListenAndServe(":9100", nil)
 ```
 
+## `extends` example
+
+A base template can be inherited using the `{{ extends "base.tpl" }}` statement.
+
+> Note: The `extends` statement must be on the first line of the template file
+
+```text
+templates/
+  |_ base.tpl
+  |_ home.tpl
+  |_ about.tpl
+```
+
+`templates/base.tpl` base template contents:
+
+```gotemplate title="base.tpl"
+<html lang="en">
+  <head>
+    <title>layout example</title>
+  </head>
+  <body>
+    {{ block "content" . }}
+    <h1>Hello, at base template</h1>
+    {{ end }}
+  </body>
+</html>
+```
+
+`templates/home.tpl` contents:
+
+```gotemplate title="home.tpl"
+{{ extends "base" }}
+
+{{ define "content" }}
+  <h1>Hello, {{ .Name | upper }}</h1>
+  <h2>At template {{ current_tpl }}</h2>
+  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
+{{ end }}
+```
+
+### Usage
+
+```go
+package main
+
+import (
+    "net/http"
+    
+    "github.com/gookit/easytpl"
+    "github.com/gookit/slog"
+)
+
+func main() {
+    v := easytpl.NewExtends(easytpl.WithTplDirs("templates"))
+
+    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+        v.Render(w, "home", easytpl.M{"Name": "tom"})
+    })
+    
+    slog.Info("Listening port: 9100")
+    http.ListenAndServe(":9100", nil)
+}
+```
+
 ## Available Options
 
 ```go
@@ -172,7 +239,7 @@ Debug bool
 Layout string
 // Delims define for template
 Delims TplDelims
-// ViewsDir the default views directory
+// ViewsDir the default views directory, multi use "," split
 ViewsDir string
 // ExtNames allowed template extensions. eg {"tpl", "html"}
 ExtNames []string
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 0fae177..293a6f0 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -5,7 +5,7 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/gookit/easytpl)](https://goreportcard.com/report/github.com/gookit/easytpl)
 [![Unit-Tests](https://github.com/gookit/easytpl/workflows/Unit-Tests/badge.svg)](https://github.com/gookit/easytpl/actions)
 
-一个简单的视图渲染器，基于golang `html/template` 封装，但更加简单易用。
+一个简单的模板渲染器，基于Golang `html/template` 封装，但更加简单易用。
 
 > **[EN README](README.md)**
 
@@ -15,6 +15,7 @@
 - 支持布局文件渲染
   - eg `{{ include "header" }} {{ yield }} {{ include "footer" }}`
 - 支持引入其他模板 eg `{{ include "other" }}`
+- 支持使用 `extends` 继承基础模板. eg `{{ extends "base.tpl" }}`
 - 内置一些常用的模板方法 `row`, `lower`, `upper`, `join` ...
 
 ## GoDoc
@@ -81,7 +82,7 @@ func main()  {
 
 > 跟多API请参考 [GoDoc](https://pkg.go.dev/github.com/gookit/easytpl) 
 
-## 布局示例
+## layout 布局示例
 
 - `include` 包含其他模板
 
@@ -137,10 +138,10 @@ templates/
   <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
 ```
 
-### 使用
+### 使用示例
 
 ```go
-v := easytpl.NewInitialized(func(r *easytpl.Renderer) {
+v := easytpl.NewInited(func(r *easytpl.Renderer) {
     // setting default layout
     r.Layout = "layouts/default" // equals to "layouts/default.tpl"
     // templates dir. will auto load on init.
@@ -150,16 +151,80 @@ v := easytpl.NewInitialized(func(r *easytpl.Renderer) {
 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 	v.Render(w, "home", easytpl.M{"Name": "tom"})
 })
-log.Println("Listening port: 9100")
+
+slog.Println("Listening port: 9100")
 http.ListenAndServe(":9100", nil)
 ```
 
+## `extends` 继承示例
+
+可以使用 `extends` 语句继承基础模板. eg `{{ extends "base.tpl" }}`
+
+> 注意: `extends` 语句必须在模板文件的第一行
+
+```text
+templates/
+  |_ base.tpl
+  |_ home.tpl
+  |_ about.tpl
+```
+
+`templates/base.tpl` 基础模板文件:
+
+```gotemplate title="base.tpl"
+<html lang="en">
+  <head>
+    <title>layout example</title>
+  </head>
+  <body>
+    {{ block "content" . }}
+    <h1>Hello, at base template</h1>
+    {{ end }}
+  </body>
+</html>
+```
+
+`templates/home.tpl, templates/about.tpl` 模板文件:
+
+```gotemplate title="home.tpl"
+  {{ extends "base" }}
+{{ define "content" }}
+  <h1>Hello, {{ .Name | upper }}</h1>
+  <h2>At template {{ current_tpl }}</h2>
+  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
+{{ end }}
+```
+
+### 使用示例
+
+```go
+package main
+
+import (
+    "net/http"
+    
+    "github.com/gookit/easytpl"
+    "github.com/gookit/slog"
+)
+
+func main() {
+    v := easytpl.NewExtends(easytpl.WithTplDirs("templates"))
+
+    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+        v.Render(w, "home", easytpl.M{"Name": "tom"})
+    })
+    
+    slog.Info("Listening port: 9100")
+    http.ListenAndServe(":9100", nil)
+}
+```
+
 ## 可用选项
 
 ```go
 // 开启调试
 Debug bool
-// 默认的视图模板目录
+// 默认的视图模板目录，可以是多个目录，使用逗号分隔
 ViewsDir string
 // 布局模板名称
 Layout string
@@ -199,7 +264,7 @@ r.MustInit()
 - 方法 3 (简单快捷)
 
 ```go
-r := easytpl.NewInitialized(func (r *Renderer) {
+r := easytpl.NewInited(func (r *Renderer) {
 	r.Layout = "layouts/default" 
 	// ... ...
 })