Abstract: Based on the study of the 1:50000 geological mapping and field survey in some places, the rock groups of Proterozic Alashan Group that was mapped by 1:200000 geological survey in 1978 may be correlated the Neo-Archean Seertengshan Group in Middle Inner Mongolia,and the third bed of Zhuzhongmaodao formation is actually a series of structural conglomerate.After studying the macroscopic and microcosmic features,the authors discussed the genetic mechanism of the conglomerate.