采用ＳＥＭ 和ＷＡＸＤ分析了高取向ＨＤＰＥ的形态、晶粒尺寸及结晶度。ＨＤＰＥ经口模拉伸，形态由初始材料的微球状结构转变为纤维结构。随着拉伸比的提高，晶粒沿拉伸方向（ｃ轴）的尺寸增大、横向（ａ，ｂ轴）尺寸减小、有序性提高，结晶度增大。口模温度提高，晶粒沿ａ，ｂ，ｃ轴的尺寸均增大，有序性和结晶度提高。表明口模拉伸过程中既存在应力诱导的结晶过程，又存在温度诱导的二次重结晶过程。 Morphology, grain size and crystallinity of HDPE were analyzed by SEM and WAXD. HDPE through the die stretch, the morphology of the microspheres from the initial structure of the material into a fiber structure. With the increase of draw ratio, the size of the grains along the stretching direction (c-axis) increases, the size of the transverse (a, b-axis) decreases, the orderliness improves, and the crystallinity increases. Die temperature increases, along the a, b, c axis size increases, the orderliness and crystallinity increased. It shows that both the stress-induced crystallization process and the temperature-induced secondary recrystallization process exist in the die drawing process.