Abstract: WEB coal mine networking monitoring system has the features of a large volume of data,high real-time requirements.Therefore,the performance optimization about data processing should be done to avoid the repeatly downloading of redundancy data.The traditional techniques uses to refresh the entire web page to update the page data,and there are two flaws in this way.First,the entire page refreshing will produce the flashes,which will effect on the feel of viewer;second,refreshing the entire web page will repeatly download the redundancy data every time,which leads to the increasing of data and showing delay.The use of AJAX technology which only need to download the real-time data solves the traditional techniques flaws fundamentally.