Abstract: East China Sea shelf basin is an oil-bearing superimposed basin of Meso-Cenozoic based on the complex base of Proterozoic-Palaeozoic.Taipei depression is located in the southern part of the west of East China Sea shelf basin.The sedimentary system of Mesozoic continental lacustrine developed mudstone of Fuzhou formation and mudstone of Shimentan formation.In combination with the hydrocarbon source rock evaluation index,namely organic matter abundance,organic matter type and organic matter maturity,the hydrocarbon generation potential analysis of Fuzhou and Shimentan formations has been carried out.The research results indicate the organic matter abundance is high in Fuzhou formation and low in Shimentan formation.The organic matter type is type-Ⅲin Fuzhou formation source rock and typeⅡ2-Ⅲ in Shimentan formation,and the organic matter is at mature stage.The hydrocarbon source rock evaluation results show that the Fuzhou formation mudstone has better hydrocarbon generation potential.