diff --git a/GUIDE.md b/GUIDE.md
index b50c590..f4c694d 100644
--- a/GUIDE.md
+++ b/GUIDE.md
@@ -53,6 +53,8 @@ brew install tw93/tap/mole
 
 > 💡 什么是 Homebrew？一个 Mac 软件管理工具。如果你不知道这是什么，请使用方法一。
 
+> ⚠️ **重要：** 只选择一种方法安装！不要同时用两种方法，会产生冲突。
+
 > ⚠️ 注意：第一次安装可能会要求你输入 Mac 的登录密码（输入时不会显示任何字符，这是正常的）
 
 ---
@@ -167,11 +169,13 @@ Mole 有智能保护机制：
 ### 如何更新 Mole？
 
 **如果是一键安装的：**
+
 ```bash
 mole update
 ```
 
 **如果是 Homebrew 安装的：**
+
 ```bash
 brew upgrade mole
 ```
diff --git a/README.md b/README.md
index deb90b9..b0e5d24 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ Or via Homebrew:
 brew install tw93/tap/mole
 ```
 
+> ⚠️ **Note:** Choose one installation method. Don't mix both to avoid conflicts.
+
 > 📖 **不会用终端？** 查看 [小白使用指南](./GUIDE.md) 了解详细的教程
 
 ## Usage
diff --git a/install.sh b/install.sh
index bd43718..00f57f0 100755
--- a/install.sh
+++ b/install.sh
@@ -169,6 +169,17 @@ check_requirements() {
         exit 1
     fi
 
+    # Check if already installed via Homebrew
+    if command -v brew >/dev/null 2>&1 && brew list mole >/dev/null 2>&1; then
+        log_warning "Mole is already installed via Homebrew"
+        echo ""
+        echo "Please choose one installation method:"
+        echo "  1. Keep Homebrew version (recommended): brew upgrade mole"
+        echo "  2. Switch to manual install: brew uninstall mole && then re-run this script"
+        echo ""
+        exit 1
+    fi
+
     # Check if install directory exists and is writable
     if [[ ! -d "$(dirname "$INSTALL_DIR")" ]]; then
         log_error "Parent directory $(dirname "$INSTALL_DIR") does not exist"
diff --git a/mole b/mole
index 02ae123..43f9f99 100755
--- a/mole
+++ b/mole
@@ -139,6 +139,16 @@ show_help() {
 
 # Simple update function
 update_mole() {
+    # Check if installed via Homebrew
+    if command -v brew >/dev/null 2>&1 && brew list mole >/dev/null 2>&1; then
+        echo -e "${YELLOW}Mole is installed via Homebrew${NC}"
+        echo ""
+        echo "Please use Homebrew to update:"
+        echo -e "  ${GREEN}brew upgrade mole${NC}"
+        echo ""
+        exit 0
+    fi
+
     log_info "Updating Mole..."
 
     local installer_url="https://raw.githubusercontent.com/tw93/mole/main/install.sh"