), was tested attreatment with the was not adjusted and acted as the control. There were group. The n and were recorded breeding cycle, treatments had a significantly better effect on of water In T1 and T2, tsignificantly T3 and T4 , T3 and T4 alkalinity wasinterval of adjustment in adding In the late breeding period, the high alkalinity of the water and filler layer and thus total number of bacteria and nitrogen cycle bacteria were significantly higher than the number in low-alkalinity water. This trend was more obvious with increasing water depth. The mechanism of the ecological impact of mainly affects the number of microbes and microbial decomposition efficiency. The growth of microorganisms and increase in decomposition efficiency reduces ammonia nitrogen and inorganic nitrogen concentrations, and thereby maintains a better growth environment for shrimp and thus the growth of shrimp. In conclusion, in a , ) can effectively increase the number ofthereby improving the amount of alkalinity)