Abstract: According to the drilling,logging,well logging,well testing,production testing data,combined with structure research results of Majing in recent years,by using the theories from sedimentology,high-resolution sequence stratigraphy,petroleum geology,and etc.,the gas layer division and correlation of Penglaizhen formation in Majing has been carried out.And then gas layers,sand layers and sub-layers have been accurately classified and the stratification standard in the study area has been established,and the results on gas layer division and correlation have been obtained.The research results indicate the gas reservoir in Penglaizhen formation can be reasonably divided into 4 gas reservoirs.