Based on the analysis of 18 coal-measure source rock samples of Jurassic in Junggar basin, the results of rock pyrolysis, organic carbon test, vitrinite reflectance test and microscopic component identification show that the evaluation results of organic matter types obtained by pyrolysis method and microscopic type index method are contradictory.When pyrolysis method was used to determine the type of organic matter in source rocks of coal measures, the type of organic matter in coal measures is the best, followed by carbonaceous mudstone, and mudstone is the worst; while when organic micro type index method was used to determine the type of organic matter, the type of organic matter in mudstone is the best, followed by carbonaceous mudstone, and coal is the worst.It is found that the vitrinite, which is traditionally believed to be non hydrocarbon generating, has an important contribution to hydrocarbon generation.The recognition of hydrocarbon generating ability of vitrinite is the key to the contradiction between the two methods of organic matter type evaluation.For the source rocks of coal measures, the classification of organic matter types by pyrolysis method is more accurate and economical.