Abstract: The estuary water after being disinfected and deposited was used as foundational water in experiment. The foam separator , pre2cultured biofilter and ultraviolet disinfector were applied to treat recirculating water in breeding for Macrobrachium rosenbargii larva. The quality of recirculating water was controlled effectively by the water treatment system. The water quality was controlled with traditional method in control pond , in which a lot of medicine and water exchanging was applied ,so the amount of water in test pond with no medicine or water exchanging was 67. 5 % less than that in control pond. The variety of main parameter of recirculating water in test pond during the experiment were as follows : NH32Nm:0 -0.010 mg?L -1 ,NO2 2N :0.01 -0.63 mg?L -1 ,pH: 7.48-8.37,CODMn : 5.42 -12.25mg?L -1 , bacterium : (4. 2 -130) ?103cell ?mL -1, vibrio: (0.2 -20) ? 102cell?mL -1. The survival rate of experiment pond was 40 % , which was 33. 3 % more than that in control pond. Good result was also obtained in the productive test , in which the survival rates of productive test pond and control pond were both 30 %. The model on recirculating water treatment in breeding larva of Macrobrachium rosenbargii is proposed according to the experimental result and breeding character of Macrobrachium rosenbargii.