Study with different aged Phyllostachys praecox cv.Prevernalis leaves as material showed that 1-2-year P. praecox cv.Prevernalis had better assimilation productivity than 3-5 year ones. 1-2-year P. praecox cv.Prevernalis had higher specific leaf weight, net photosynthetic rate, stomatic conductivity and transpiration rate than that of 3-5-years ones. Cha/Chb ratio of 1-2-year bamboo was higher although their chlorophyll content was nearly the same. Meantime, analysis was carried out on photosynthetic influe...