Southern Shanxi and north-east Sichuan area was one of the most undeveloped and counter-revolution area of modern China. The Red Army had not only brought Marxism there and set up Sichuan-Shanxi revolutionary base successfully, but also made it the second base in large ,after they entered this area .As The Red Army and The provincial party committee of Sichuan-Shanxi popularized Marxism in the area , they had obtained lots of experience. Today, it is very useful for the project of national popularization of Marxism to analyse their past successful experience, especially in western undeveloped region.