The Lower Triassic Jialingjiang Formation in Chishui region, Guizhou is a carbonate platform deposit. The reservoir of the Member 21-Member1 of the Lower Triassic Jialing Formation consists of grain limestone, crystal powder dolomitite with low porosity and low permeability. The developmental degree of favorable reservoir is Baoyuan, Wanglong and Taihe structures in descending order.