Abstract: With the development of Web program technology,the same type subject pages can show the same visual feature information of the Web page by using different HTML tags,resulting in existing Web structure similarity algorithm which measures the structure similarity of the Web page base on matching the HTML tag name information can’taccurately recognize the same type subject pages.So,we proposed a recognition algorithm for the same type subject pages based on the tag tree adjacency matrix.This algorithm constructs Web page tag tree’s adjacency matrix and re-cognizes the same type subject pages by computing the structure similarity between the Web pages through the tag tree adjacency matrix.The experimental results indicate that the optimal performance of the algorithm can reach 100% recall rate and 96% precision rate,and the average performance can reach 97% recall rate and 89% precision rate.

Key words: Web page structure,Html tag,Tag tree adjacency matrix