diff --git a/src/util/generatechaptcha.lua b/src/util/generatechaptcha.lua
index 4789024..08eb15e 100644
--- a/src/util/generatechaptcha.lua
+++ b/src/util/generatechaptcha.lua
@@ -18,9 +18,9 @@ local function generate_captcha()
     local uid = uuid.generateUuid()
     --picgid
     local filename = uid
-    --图片78x26
-    local width = 78
-    local height = 26
+    --图片120x40
+    local width = 120
+    local height = 40
     -- 创建画布
     local im = gd.createTrueColor(width, height)
 
@@ -41,20 +41,20 @@ local function generate_captcha()
     gd.useFontConfig(true)
     for i = 1, 4 do
         local char = string.sub(captcha_text, i, i)
-        local x = 10 + (i-1)*25 + math.random(-5,5)
+        local x = 10 + (i - 1) * 25 + math.random(-5,5)
         local y = 10 + math.random(-5,5)
         local angle = math.random(-20, 20)
-        im:stringFT(black, "Arial:bold", 18, angle, x, 30, char)
+        im:stringFT(black, "Arial:bold", 18, angle, x, y, char)
     end
     -- 添加干扰线
     for i = 1, 5 do
         local line_color = im:colorAllocate(math.random(0,255), math.random(0,255), math.random(0,255))
-        im:line(math.random(0, height), math.random(0, width), math.random(0,height), math.random(0, width), line_color)
+        im:line(math.random(0, width), math.random(0, height), math.random(0,width), math.random(0, height), line_color)
     end
     -- 添加噪点
     for i = 1, 100 do
         local dot_color = im:colorAllocate(math.random(0,255), math.random(0,255), math.random(0,255))
-        im:setPixel(math.random(0, height), math.random(0, width), dot_color)
+        im:setPixel(math.random(0, width), math.random(0, height), dot_color)
     end
     -- 将图片转换为PNG格式的二进制数据
     local png_data = im:pngStr(75)