Abstract: In order to search coal resources in Yanyuan Area of Sichuan Province and to have the coal accumulation law of the area,basedon the satellite remote sens ing technology,site measurement of strata profil,drilling exploration,logging and related tests as the mainmeans,the basic theory and method of the sedimentology and coa lfield geology were applied to analyze the sedimentary environment,evolu-tion and coal accumulation law of Longtan Formation in Yanyuan Area. A tidal delta and tidal flat sedimentary facies were distinguished inLongtan Formation. The study results showed that the peat swamp of the delta plain and intertidal peat flat would be the favorable coal ac-cumulation environment in Yanyuan Area. Meanwhile, according to the strata, tectonic,coal accumulation features,seam,topography andother conditions of the study area,three important coal bearing areas of Hepingzi,Zhongliangzi and Taozi coal bearing areas were set up inXiaogaoshan and Gaizu-taozi Coal-Bearing Prospective Area s. Thus those areas would provide favorable target area for the further surveywork and could provide the basis to search coal resources in the Permian at Western Sichua