Abstract: The restitution methods of the organic abundance are classified systematically based on the comprehensive analyses of these methods,and the advantages and disadvantages,as well as the applicable conditions of these methods are comprehensively compared.The results show that the pyrolysis simulation experiment is a relatively better organic abundance restitution method.The organic carbon of the 5 sets of hydrocarbon source rocks from the Wuerxun and the Beier Sags,the Hailaer Basin has been restituted by using this organic abundance restitution method,and the resource amount has been calibrated.According to the results,the restitution coefficients of the organic carbon of the Wuerxun and the Beier Sags are 1.10~1.32 and 1.03~1.18 respectively,with differences between various sets of the source rocks,and about 1.86×10⁸t extra resources has been calculated after the restitution.So restitution of organic matter abundance is very important in correctly evaluating potential petroliferous basins,especially the sedimentary basins with relatively high mature source rocks.