This paper is by the synthesis analysis to a large number of geochemical data, and has systematically research to the source rock features of the different age of the south of the Dabashan and Micangshan, points out major source rock are C1S1 and P1. Similar to the Sichuan Basin, in this area, the precentage of organic carbon of I’s grade of source rock is higher, the kerogen type is good, the maturity reach over mature, and the horizon distribution is stable. The heat evolution history research of source rock indicates, the heat evolution level of its is lower in the period of the Paleozoic, and the oil-gas fromation phase by control of Jurassic stratum deposit thickness. The oil windows of C1 is upper Triassic-lower Jurassic, and natrual gas windows is lower Jurassic-upper Jurassic; The oil windows of S1 is lower Jurassic-middle Jurassic, and natural gas windows is middle Jurassic-Cretaceous; The oil windows of P1 is middle Jurassic-upper Jurassic, and natural gas windows is upper Jurassic-Cretaceous. This possesses important referennce to the research of source rock of high evolution area, and for oil-gas correlating, magrating and gathering of this area has established on the foundtaion.