diff --git a/scripts/combine.lua b/scripts/combine.lua
index c0c39e9..29a4273 100644
--- a/scripts/combine.lua
+++ b/scripts/combine.lua
@@ -21,13 +21,9 @@ if len == 0 then
     ngx.log(ngx.ERR, "No images to combine!")
     return ;
 end
+
 local origin = {}
-for i = 1, len do
-    ngx.log(ngx.INFO, "COMBINE FILE ->", data[i])
-    local cmd = convert .. " -resize 1280x " .. data[i] .. " " .. data[i] .. ".png"
-    ngx.log(ngx.INFO, 'CMD RESIZE -> ', cmd)
-    origin[i] = file_dir .. "/" .. data[i] .. ".png "
-end
+
 -- 从 nginx 变量取
 local convert = ngx.var.convert
 
@@ -37,6 +33,13 @@ if not convert then
     return
 end
 
+for i = 1, len do
+    ngx.log(ngx.INFO, "COMBINE FILE -> ", data[i])
+    local cmd = convert .. " -resize 1280x " .. data[i] .. " " .. data[i] .. ".png"
+    ngx.log(ngx.INFO, 'CMD RESIZE -> ', cmd)
+    origin[i] = file_dir .. "/" .. data[i] .. ".png "
+end
+
 local cmd = convert .. " -append " .. table.concat(origin, " ") .. " " .. combined
 ngx.log(ngx.INFO, 'CMD APPEND -> ', cmd)
 io.popen(cmd)