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The Subei Basin and South Yellow Sea Basin belong to the same tectonic unit�� The study on the hydrocarbon source rock's development regulation in Subei Basin is important for the Yellow Sea oil--gas explora- tion�� Based on field geological research and actual measurement data of 69 hydrocarbon source rocks��combining the data of analytical test and oil-gas exploration��we analyzed the Mesozoic--Paleozoic marine hydrocarbon source rocks in thickness��distribution and geochemical characteristics in Subei Basin�� The results show that the hydrocar- bon source rocks in whole is along the NE trend in extension�� In the Mesozoic--Paleozoic��exists several hydrocar- bon source rock developmental centers��and obviously has extension trend along the South Yellow Sea area�� The thermal evolutionary degree of Lower Paleozoic is higher in general than the Upper Paleozoic��and has regional het- erogeneity�� The thermal evolutionary degree of Permian is relatively lower��and has secondary hydrocarbon genera- tion potential�� The study on the characteristics of hydrocarbon source rocks from the Mesozoic--Paleozoic marine strata in Subei Basin further reveals that the South Yellow Sea Basin has good oil--gas exploration potential��