The experiments of Potamogeton crispus growth under different water transparencies were conducted in lab condition. The results showed that this submerged plant cannot be survived on low water transparency when Secchi depth was less than 12cm. The growth of Potamogeton crispus was significantly inhibited under the transparency of 15cm, compared to those under the transparencies of 20cm, 35cm, and 70cm (comparison group) on biomass basis. The regression analysis confirmed that the plant′s growth patterns all fit a logistic curve. The logistic model was then applied to describe the growth regularity, estimating growth parameters under different water transparencies. The simulation indicated that the water transparency has significant effect on intrinsic rate of natural increase rm, while less effect on environmental capacity k. Based on the above results, the dynamic growth model with parameters of water depth and transparency was finally developed to predict the dynamic process of Potamogeton crispus growth under the external factors.