diff --git a/apisix/plugins/tencent-cloud-cls.lua b/apisix/plugins/tencent-cloud-cls.lua
index e2a69aa38b2e..2a6190b49e4f 100644
--- a/apisix/plugins/tencent-cloud-cls.lua
+++ b/apisix/plugins/tencent-cloud-cls.lua
@@ -19,8 +19,7 @@ local core = require("apisix.core")
 local log_util = require("apisix.utils.log-util")
 local bp_manager_mod = require("apisix.utils.batch-processor-manager")
 local cls_sdk = require("apisix.plugins.tencent-cloud-cls.cls-sdk")
-local random = math.random
-math.randomseed(ngx.time() + ngx.worker.pid())
+local math = math
 local ngx = ngx
 local pairs = pairs
 
@@ -35,7 +34,12 @@ local schema = {
         -- https://console.cloud.tencent.com/capi
         secret_id = { type = "string" },
         secret_key = { type = "string" },
-        sample_rate = { type = "integer", minimum = 1, maximum = 100, default = 100 },
+        sample_ratio = {
+            type = "number",
+            minimum = 0.00001,
+            maximum = 1,
+            default = 1
+        },
         include_req_body = { type = "boolean", default = false },
         include_resp_body = { type = "boolean", default = false },
         global_tag = { type = "object" },
@@ -76,11 +80,13 @@ end
 
 function _M.access(conf, ctx)
     -- sample if set
-    if conf.sample_rate < 100 and random(1, 100) > conf.sample_rate then
-        core.log.debug("not sampled")
+    ctx.cls_sample = false
+    if conf.sample_ratio == 1 or math.random() < conf.sample_ratio then
+        core.log.debug("cls sampled")
+        ctx.cls_sample = true
         return
     end
-    ctx.cls_sample = true
+    core.log.debug("cls not sampled")
 end
 
 
@@ -94,7 +100,7 @@ end
 function _M.log(conf, ctx)
     -- sample if set
     if not ctx.cls_sample then
-        core.log.debug("not sampled")
+        core.log.debug("cls not sampled, skip log")
         return
     end
     local metadata = plugin.plugin_metadata(plugin_name)
@@ -110,10 +116,6 @@ function _M.log(conf, ctx)
         entry = log_util.get_full_log(ngx, conf)
     end
 
-    if not entry.route_id then
-        entry.route_id = "no-matched"
-    end
-
     if conf.global_tag then
         for k, v in pairs(conf.global_tag) do
             entry[k] = v
diff --git a/apisix/plugins/tencent-cloud-cls/cls-sdk.lua b/apisix/plugins/tencent-cloud-cls/cls-sdk.lua
index ab4f0d40c558..2a53abcefde6 100644
--- a/apisix/plugins/tencent-cloud-cls/cls-sdk.lua
+++ b/apisix/plugins/tencent-cloud-cls/cls-sdk.lua
@@ -25,13 +25,11 @@ local core = require("apisix.core")
 local core_gethostname = require("apisix.core.utils").gethostname
 local json = core.json
 local json_encode = json.encode
-
 local ngx = ngx
 local ngx_time = ngx.time
 local ngx_now = ngx.now
 local ngx_sha1_bin = ngx.sha1_bin
 local ngx_hmac_sha1 = ngx.hmac_sha1
-
 local fmt = string.format
 local table = table
 local concat_tab = table.concat
@@ -58,13 +56,14 @@ local params_cache = {
     headers = headers_cache,
 }
 
+
 local function get_ip(hostname)
     local _, resolved = socket.dns.toip(hostname)
-    local ListTab = {}
+    local ip_list = {}
     for _, v in ipairs(resolved.ip) do
-        insert_tab(ListTab, v)
+        insert_tab(ip_list, v)
     end
-    return ListTab
+    return ip_list
 end
 
 local host_ip = tostring(unpack(get_ip(core_gethostname())))
@@ -73,14 +72,17 @@ local log_group_list_pb = {
     logGroupList = log_group_list,
 }
 
+
 local function sha1(msg)
     return str_util.to_hex(ngx_sha1_bin(msg))
 end
 
+
 local function sha1_hmac(key, msg)
     return str_util.to_hex(ngx_hmac_sha1(key, msg))
 end
 
+
 -- sign algorithm https://cloud.tencent.com/document/product/614/12445
 local function sign(secret_id, secret_key)
     local method = "post"
@@ -109,6 +111,7 @@ local function sign(secret_id, secret_key)
     return concat_tab(arr, '&')
 end
 
+
 local function send_cls_request(host, topic, secret_id, secret_key, pb_data)
     local http_new = http:new()
     http_new:set_timeouts(cls_conn_timeout, cls_send_timeout, cls_read_timeout)
@@ -146,6 +149,7 @@ local function send_cls_request(host, topic, secret_id, secret_key, pb_data)
     return true
 end
 
+
 -- normalized log data for CLS API
 local function normalize_log(log)
     local normalized_log = {}
@@ -173,6 +177,7 @@ local function normalize_log(log)
     return normalized_log, log_size
 end
 
+
 local function send_to_cls(secret_id, secret_key, host, topic_id, logs)
     clear_tab(log_group_list)
     local now = ngx_now() * 1000