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0.83 kg/h,。 The structure and operating theory of a 075 kW aspirating aerator, which has been patented in six foreign countries (including USA) as well as in China, was described and the parameters of the machine parts were also presented. The machine parts screening tests indicated that the highest air inspiration and aeration efficiency were achieved when the taper nozzle was 24 mm in diameter, water and air mixing ejection tube was 52 mm in diameter and 1 500 mm in length, air intake tube was 48 mm in diameter, ball-shaped air chamber was 172 mm in diameter, and the flow rate and the lift head of the submersible pump was 20 m3/h and 8 m. The maximum air inspiration of the aerator was 56.0 m3/(kW?h), and the aeration capacity and the aeration efficiency of the machine were 0.83 kg/h and 1.09 kg/(kW?h) respectively. The characteristics of the machine are bigger air inspiration, better aeration capacity and simple structure. The machine is a submersible aerator that can mix farming water and disperse oxygen in the basin. It can be used in fish farming for the purpose of aeration. Many aerators have been used successfully in intensive shrimp farming.