Abstract: Hy drocarbon resource rocks of Huqing oil field mainly exist in the member of Es₃ in the slope and of Es₁ and Es₃ in Liutun-Haitongji subsag.According to the study of types and abundance of organic, biomarkers and thermal evolution, the character are:low data of Pr/Ph (<1), relative great content of γ-gamma cerane, upper ratio of C₂₇/(C₂₈+C₂₉) and growth of aquicolous pelagic animals and plants.These show that hydrocarbon resource rocks come into being in salt and reductive environment. Hydrocarbon resource rocks can be divided into three types:low mature-immature, over mature and over mature-mature.