Abstract: Abstract: Aiming at the large volume and high energy consumption of the existing aerators, we designed a micro-bubble aerator based on the principle of jet pump technology. The main body of the device was divided into four parts, and the optimal parameters of these parts were determined by experiment. The results showed that when the liquid flow was 4.23 m3/h, nozzle-to-throat clearance was 40 mm, and throat-pipe length was 120 mm, the optimum oxygen-adding effect could be obtained. In this case, the dissolved oxygen amount in the water was 11.23 mg/L, which was in super saturation state and higher than the saturation value (10.83 mg/L) at 12℃. This device has a wide application value in aquaculture, sewage treatment and aerated irrigation due to its obvious oxygen-adding effect, simple structure and small volume.