Abstract: In this paper, the consistence between PCA method and distorting method of the mathematical model in the study of survey networks is researched. As a practical example, the simulating experiments of an accelerator ring-shaped network are made, The results show that both methods are consistent under some conditions. It not only reveals the reason for specific regularity existing in the simulating curves, but also find an effective way to avoid a lot of simulating experiments. Meanwhile some author's views are given.