diff --git a/install.sh b/install.sh
index ac353d8..16a4db5 100644
--- a/install.sh
+++ b/install.sh
@@ -99,24 +99,22 @@ install_nodejs() {
     fi
 }
 
-# 配置数据库（固定密码 12345678，安装时覆盖旧数据）
+# 配置数据库（固定密码 12345678，强制删除旧库与用户并重建）
 setup_database() {
     echo -e "${YELLOW}[4/7] 配置数据库...${NC}"
     
     systemctl enable postgresql
     systemctl start postgresql
     
-    # 固定数据库密码，安装时覆盖旧库与用户
-    DB_PASSWORD="12345678"
-    
-    # 先删除旧数据库和用户（覆盖旧数据）
-    sudo -u postgres psql -c "DROP DATABASE IF EXISTS funmc;" 2>/dev/null || true
-    sudo -u postgres psql -c "DROP USER IF EXISTS funmc;" 2>/dev/null || true
+    # 强制断开对 funmc 库的所有连接，再删除库和用户（避免 role already exists / 无法删除库）
+    sudo -u postgres psql -d postgres -c "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = 'funmc' AND pid <> pg_backend_pid();" 2>/dev/null || true
+    sudo -u postgres psql -d postgres -c "DROP DATABASE IF EXISTS funmc;" 2>/dev/null || true
+    sudo -u postgres psql -d postgres -c "DROP USER IF EXISTS funmc;" 2>/dev/null || true
     
     # 创建用户和数据库
-    sudo -u postgres psql -c "CREATE USER funmc WITH PASSWORD '$DB_PASSWORD';"
-    sudo -u postgres psql -c "CREATE DATABASE funmc OWNER funmc;"
-    sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE funmc TO funmc;"
+    sudo -u postgres psql -d postgres -c "CREATE USER funmc WITH PASSWORD '12345678';"
+    sudo -u postgres psql -d postgres -c "CREATE DATABASE funmc OWNER funmc;"
+    sudo -u postgres psql -d postgres -c "GRANT ALL PRIVILEGES ON DATABASE funmc TO funmc;"
     
     # 配置 pg_hba.conf
     PG_HBA=$(sudo -u postgres psql -t -c "SHOW hba_file;" | xargs)
@@ -126,8 +124,7 @@ setup_database() {
         systemctl reload postgresql
     fi
     
-    echo -e "${GREEN}✓ 数据库配置完成（密码已设为 12345678，已覆盖旧数据）${NC}"
-    echo "$DB_PASSWORD" > /tmp/funmc_db_password
+    echo -e "${GREEN}✓ 数据库配置完成（密码 12345678，已强制覆盖旧数据）${NC}"
 }
 
 # 下载并编译 FunMC
@@ -167,7 +164,7 @@ build_funmc() {
 configure_services() {
     echo -e "${YELLOW}[6/7] 配置服务...${NC}"
     
-    DB_PASSWORD=$(cat /tmp/funmc_db_password)
+    DB_PASSWORD="12345678"
     JWT_SECRET=$(openssl rand -base64 48 | tr -dc 'a-zA-Z0-9' | head -c 48)
     ADMIN_PASSWORD=$(openssl rand -base64 16 | tr -dc 'a-zA-Z0-9' | head -c 12)