This study used a principal component analysis on the competitiveness of 31 tourism website to quantitatively evaluate,to calculate the travel sites of standardized competitiveness score,using the theory of diffusion breaking point to divide the scope of its radiation,generated radiation range diagram by Arc Gis. Research shows that: 1Tour website information of radiation range size depends not only on the web site of the standardized competitiveness,also depends on Euclidean distance of adjacent site. 2The...