Abstract: Using tree structure to organize data has the attributes as clear hierarchy，easy to operate，wide range of uses.This paper introduces a method based VS.NET which design and realize the strategy that mass datas fast loading on the Web-based tree structure，through an improved algorithm based on the breadth priority that loading data with tree structure scatteredly according to certain levels and needs，which well solve the problems of inefficiency and delay when mass datas are loading on the tree structure on website，the results of practical application show a desired effect.