diff --git a/config/index.js b/config/index.js
index 3e097b47be8..ea95720876d 100644
--- a/config/index.js
+++ b/config/index.js
@@ -12,15 +12,15 @@ module.exports = {
         process.env.RSSBOT_DB_PATH ||
         path.join(__dirname, '../data/database.db'),
     lang: process.env.RSSBOT_LANG || 'zh-cn',
-    item_num: process.env.RSSBOT_ITEM_NUM || 10,
+    item_num: parseInt(process.env.RSSBOT_ITEM_NUM) || 10,
     fetch_gap: process.env.RSSBOT_FETCH_GAP || '5m',
-    notify_error_count: process.env.NOTIFY_ERR_COUNT || 5,
+    notify_error_count: parseInt(process.env.NOTIFY_ERR_COUNT) || 5,
     view_all: !!process.env.RSSBOT_VIEW_ALL || false,
     UA:
         process.env.RSSBOT_UA ||
         `Mozilla/5.0  NodeRSSBot v${version}(https://github.com/fengkx/NodeRSSBot)`,
     not_send: process.env.NOT_SEND || false, // just for debug use
-    concurrency: process.env.RSSBOT_CONCURRENCY || 200,
+    concurrency: parseInt(process.env.RSSBOT_CONCURRENCY) || 200,
     delete_on_err_send: process.env.DELETE_ON_ERR_SEND || true, // block and chat not found
-    resp_timeout: process.env.RSSBOT_RESP_TIMEOUT || 40
+    resp_timeout: parseInt(process.env.RSSBOT_RESP_TIMEOUT) || 40
 };