To take full advantages of LXI instruments based on LAN and allow users to control the instrument through web interface completely, a scheme to extend the capability of LXI web interface was proposed. Bclass LXI DAS is taken as the design target in the scheme and deep design to the HTML framework is implemented. Many extra functions, including realtime curve, equipment control, status display, database uploading are added to the HTML pages besides the fundamental functions; transporting LwIP protocol realizes a HTTP server in embedded chip without OS; communication based on AJAX solves key problems of dynamic HTML page and smoothing data refreshing. Finally a B/Sbased LXI DAS is built by. As for implementation, test result shows that the web interface improves interactivity and functionality of traditional ones and has better advantage in compatibility and light architecture with the B/S framework.