Abstract: The computation for room layout is time consuming,so it is difficult to be used in the web page to achieve automatic furniture placement.Based on FBS(function,behavior and structure),this paper proposed a method for online automatic layout algorithm in mobile web.Starting from the function of bedroom furniture,analyzing the usage behavior,and determining the furniture order for placement,then FBS model is constructed for the bedroom layout.Firstly designing initial static energy distribution function according to the furniture function.Then dynamic layout of energy distribution function based on the user’s online editing operation,and incremental furniture automatic layout algorithm are proposed.Experiments shows that the layout results corresponds well with the actual case,and the goal of adaptability,diversity and light-weight are meet well,and the online automatic bedroom layout can be achieved in web page.