A synthetic biological pond composed of aquatic plants,a microorganism and aquatic animals was applied in the purification of the wastewater discharged from a Trionyx sinensis breeding greenhouse,and the removal effects of TN,NH_4~+-N,TP and COD in the wastewater were analyzed.The results show that after the breeding wastewater was purified by the synthetic biological pond for about five months,TN,NH_4~+-N,TP and COD concentration in the breeding wastewater were reduced by 78%,92%,81%and 60%respectively,while DO content in the breeding wastewater increased by about four times,and there was no obvious change in water pH;previous yellow or brown and turbid sewage became yellowish and slightly turbid,and it had no smell.It is obviously seen that the purification effect of T.sinensis breeding wastewater by the synthetic biological pond composed of aquatic plants,a microorganism and aquatic animals is obvious,and the synthetic biological pond has good promotion and application prospects. A synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals was applied in the purification of the wastewater discharged from a Trionyx sinensis breeding greenhouse, and the removal effects of TN, NH_4 ~ + -N, TP and COD in the wastewater were The results show that after the breeding wastewater was purified by the synthetic biological pond for about five months, TN, NH_4 ~ + -N, TP and COD concentration in the breeding wastewater were reduced by 78%, 92%, 81% and 60% respectively, while DO content in the breeding wastewater increased by about four times, and there was no obvious change in water pH; previous yellow or brown and turbid was washed yellowish and slightly turbid, and it had no smell. It is obvious seen that the purification effect of T.sinensis breeding wastewater by the synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals is obvious, and the synthetic biological pond has good promotion and application prospects.