After the anti-Japanese War broke out, many Chinese intellectuals no longer estranged themselves from the Communist Party of China (CPC) either because of their indignation at the Kuomintang, or of their pursuit after the democracy in China, or of their sympathy for and movement by the CPC.This article explores the reasons of the expansion of the CPC by analyzing the development of the political psychology of four different schools of Chinese intellectuals respectively with WEN Yi-duo,WEI Jun-yi, ZOU Tao-fen and LI Ding-ming as representatives.