diff --git a/plugins/op_waf/shell/cpu_usage_file.sh b/plugins/op_waf/shell/cpu_usage_file.sh
index a8c44dcdf..d7df7e19a 100644
--- a/plugins/op_waf/shell/cpu_usage_file.sh
+++ b/plugins/op_waf/shell/cpu_usage_file.sh
@@ -15,10 +15,10 @@ function GetCpuUsage(){
 			cpu_total_time=`expr $cpu_total_time + $ci`
 		fi
 	done
-	#echo "user_cpu:${user_cpu}"
+	#echo "idle_cpu:${idle_cpu}"
 	#echo "cpu_total_time:${cpu_total_time}"
 
-	cpu_percet=$(awk "BEGIN{print ((${cpu_total_time}-${user_cpu})/${cpu_total_time})*100}")
+	cpu_percet=$(awk "BEGIN{print ((${cpu_total_time}-${idle_cpu})/${cpu_total_time})*100}")
 	echo "${cpu_percet}"
 	return 0
 }
diff --git a/plugins/op_waf/waf/lua/init_worker.lua b/plugins/op_waf/waf/lua/init_worker.lua
index 6185a646b..2fd4f0564 100644
--- a/plugins/op_waf/waf/lua/init_worker.lua
+++ b/plugins/op_waf/waf/lua/init_worker.lua
@@ -20,6 +20,11 @@ local waf_site_config = require "waf_site"
 C:setConfData(waf_config, waf_site_config)
 C:setDebug(true)
 
+if ngx.worker.id() == 0 then
+    C:cron()
+end
+-- C:D("init worker"..tostring(ngx.worker.id()))
+
 local function timer_stats_total_log(premature)
     C:timer_stats_total()
 end
@@ -28,6 +33,7 @@ end
 ngx.shared.waf_limit:set("cpu_usage", 0, 10)
 function timer_every_get_cpu(premature)
     local cpu_percent = C:read_file_body(waf_root.."/cpu.info")
+    -- C:D("cpu_usage:"..tostring(cpu_percent ))
     if cpu_percent then
         ngx.shared.waf_limit:set("cpu_usage", tonumber(cpu_percent), 10)
     else
@@ -35,9 +41,7 @@ function timer_every_get_cpu(premature)
     end
 end
 
-if 0 == ngx.worker.id() then
-    ngx.timer.every(5, timer_every_get_cpu)
+ngx.timer.every(5, timer_every_get_cpu)
 
-    -- 异步执行
-    ngx.timer.every(3, timer_stats_total_log)
-end
\ No newline at end of file
+-- 异步执行
+ngx.timer.every(3, timer_stats_total_log)
\ No newline at end of file
diff --git a/plugins/op_waf/waf/lua/waf_common.lua b/plugins/op_waf/waf/lua/waf_common.lua
index b658c4ccc..159875eba 100644
--- a/plugins/op_waf/waf/lua/waf_common.lua
+++ b/plugins/op_waf/waf/lua/waf_common.lua
@@ -44,35 +44,11 @@ end
 function _M.getInstance(self)
     if self.instance == nil then
         self.instance = self:new()
-        self.instance:initCron()
     end
     assert(self.instance ~= nil)
     return self.instance
 end
 
-function _M:initCron(self)
-    if 0 == ngx.worker.id() then
-        self:cron()
-    end
-end
-
-function _M.initDB(self)
-    local path = log_dir .. "/waf.db"
-    db, err = sqlite3.open(path)
-
-    if err then
-        self:D("initDB err:"..tostring(err))
-        return nil
-    end
-
-    db:exec([[PRAGMA synchronous = 0]])
-    db:exec([[PRAGMA cache_size = 8000]])
-    db:exec([[PRAGMA page_size = 32768]])
-    db:exec([[PRAGMA journal_mode = wal]])
-    db:exec([[PRAGMA journal_size_limit = 1073741824]])
-    return db
-end
-
 -- 后台任务
 function _M.cron(self)
     local timer_every_get_data = function(premature)
@@ -139,6 +115,22 @@ function _M.cron(self)
     ngx.timer.every(0.5, timer_every_import_data)
 end
 
+function _M.initDB(self)
+    local path = log_dir .. "/waf.db"
+    db, err = sqlite3.open(path)
+
+    if err then
+        self:D("initDB err:"..tostring(err))
+        return nil
+    end
+
+    db:exec([[PRAGMA synchronous = 0]])
+    db:exec([[PRAGMA cache_size = 8000]])
+    db:exec([[PRAGMA page_size = 32768]])
+    db:exec([[PRAGMA journal_mode = wal]])
+    db:exec([[PRAGMA journal_size_limit = 1073741824]])
+    return db
+end
 
 function _M.clean_log(self)
     local db = self:initDB()