Abstract: The crystal structures of several casting polypropylenes were characterized with differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). The effects of temperature, draw ratio and cooling rate on crystal structure were discussed. The main conclusions were listed as follows: drawing could increase the crystallinity of casting polypropylene, but could not induce the formation of the γ-form.Temperature and cooling rate could affect the formation of the γ-form.The slower the cooling rate, the more easily the γ-form developed; γ-form was found in the samples crystallized at 95 and 115℃ and the γ-form content of the sample at 115℃ was higher than that at 95℃.