The impeller type aerator stirs the water surface, stirring gas film and liquid film by the impeller rotating driven by the motor, and increases the contact area of gas and liquid, so as to enlarge the concentration gradient of oxygen in water and enhance the speed of oxygen transfer and diffusion from air to water. The aerator can form an oxygen enriched circle with a radius of about 10 meters in the water body centered on an aerator. In the pond test, the impeller type aerator can keep the dissolved oxygen content and water temperature in the water at the depth of 1.5 meters in accordance with the upper water body when it runs for about 80 minutes. The effect of the aeration is very obvious. By using the impeller aerator to increase the efficiency of the aquaculture water body, the quality of the aquaculture water body can be improved, for example, the hypoxic floating head of the fish and shrimp can be quickly relieved, the water layer of the pond can be broken, the primary productivity of the pond can be increased, the aquaculture density can be increased, the yield can be increased, the feed coefficient can be reduced, and the blue-green algae"bloom" can It can purify water, reduce CODcr and BOD5, remove nitrogen and phosphorus and remove ice in winter.