Hydrodynamic parameter is an important factor affecting algal bloom,so that many experiments have been carried out to simulate hydrodynamic conditions such as variable flow velocity, but the simulations have not included constant temperature and light. To consider the issues,we studied the effects of variable flow velocity on growth of Microcystia aeruginosa under constant tem-perature and light,and then analyzed the differences between 15℃ and 25℃. The results show that when the upgrowth prolonged, the time of exponential growth, maximum growth ratio and maximum biomass of algae were affected by fluid water. The growth of al-gea was influenced by fluid water which is controlled by temperature at 15 ℃, when the growth of Microcystis was inhibited by fluid water. However,at 25℃;,the growth of Microcystis promoted because the temperature improves adaptation of Microcystis to fluid water and Microcystis obtains optimal growth rate under the condition of 15cm/s.