Abstract: Overwintering environment of Synonycha grandis (Thunberg) was simulated under the indoor temperature of 15-20℃. Conservation effects of 4 kinds of supplement feeds on the adult were tested. The result indicated that the best way to overwinter was to feed the adult sugar-in-water mixed with freezing Ceratovacuna lanigera (Zehntner), the survivor rate could reach 67.5% after 210 d of conservation, propagating capacity of the survivors could be fast recovered after feeding of living C. lanigera. S. grandis was released with density of 100 ones/667 m² to sugarcane field during May to June when harmful C. lanigera broke out, which could effectively reduce the harm. Percentages of plants with aphid and leaves with aphid reduced from 50.3% and 45% to 0 respectively after 30 days' release. The control effect on C. lanigera reach 100% compared with constrast.