Abstract: One of important problems about oil -generation of vitrinite is how to distinguish and separate the hydrogen-rich and hydrogen- poor vitrinite effectively. Base on the linear relation of oil-yield of vitrinite and coal obtained in thermal simutation test with relative fluoresent intensity, we seed bounds value of relative fluoresent intensity (I_546nm,I_650nm)corresponded to the oil yield which vitrinite starts to generate and expulse oil. After they are examined and corrected by oil-generating potential (S₁ + S₂)obtained in pyrolysis test,the bounds value of I_546nm and I_650nm are regard as quantitative boundary to divide hydrogen-rich and hydrogen-poor vitrinite,and as one of the quantitative mark to evaluat hydrocarbon- generating potential of vitrinite and humic coal. The results shaw that 0. 3% (I_546nm) and 0. 46% (I_650nm) obtained in established measure condition are regard as bounds value of relative fluoresent intensity to separate hydrogen-poor and hydrogen-rich vitrinite of coal in Taiyan and Shanxi Formation in the studied area. The results remain to be discassed together and to be examined and corrected.