By pyrolytic simulation to four samples of sapropelite and three samples of humilite for the blue shifting phenomena in hydrocarbon re-generation, we draw the conclusions as follows.1)The phenomenon,red shifting and blue shifting,is the comprehensive embodiment of three factors,namely, the condensation extent of aromatic ring, generating quantity of hydrocarbon, and the release speed from the kerogen’s big molecule wet structure. 2)The molecular sieve effect of the kerogen’s big molecule wet structure is a direct reason. 3)There is a close relation between the blue shifting and lagging effect of thd hydrocarbon re-generation. 4)The intensity of the phenomena is controlled by the original maturity and content of exinite and sapropelinite. If the original maturity lie in the “window of generating oil”,with stated quantity of exinite and sapropelinite in the sample, the extent of blue shifting is stronger.