The basin analysis and reservoir description represent the leading trend ofmodern petroleum geology. With high comprehension and quantification they pro-mote greatly petroleum expioration and development. The authors applied the basintectonio-lithofacies analysis and fine reservoir description to the Sanchunji Fieldfor five years. The tectonic-lithofacies models were established by means of thebasin analysis, which expounded the prospective belts of hydrocarbon accumulationfor exploration and the reservoir geology models were founded by the reservoirdescription, which gave detailed suggestions on the further exploration and en- hancement of oil recovery. The papar advocates the application of the basin analysisand the reservoir description to many more petroleum provinces.