We report the low temperature conversion of propylene with SAPO-34 zeolite as the catalyst, as a branched route in process of methanol to propylene (MTP). The maximum conversion of propylene occurred at 300 degrees C, corresponding to the activation of propylene over low temperature acid sites of zeolite. With rate constant calculation and coke analysis at low temperature, we confirmed that adamantane is easily produced from propylene and it does not contribute to the increased conversion of reactants, but results in the cage blockage of zeolite. By detailed coke analysis and product distribution analysis, we proposed cyclic olefins, not aromatics, played the important role in hydrocarbon pool. In this regard, low temperature shows negative effect on MTP process considering the quick conversion of propylene to other olefins and the formation of adamantane, ignore of the increased ratio of propylene to ethylene ratio. The result provided new insight on the reaction mechanism of MTO/MTP system.