Abstract: Experiments were conducted on spraying different hormones with different concentrations on flowering braches of 30-year Xanthocerassorbifolium from May 2015, in Jianping, Liaoning province, and as well as spraying GA3 combined with fertilizing different ratio of N, P and K fromApril 2016. The results showed that spraying 20mg/kg of 2,4-dichlorphenoxyacetic acid (2,4-D) and 200mg/kg of gibberellins (GA3) duringfull-blooming stage had the best effect of fruit-setting rate, which was topped respectively to 83.44% and 84.58%. The average fruit-setting ratereached 93.16% of the treatment with N, P and K ratio of 2:1:2, combined with spraying 200 mg/kg of GA3. The later experiment demonstrated thatmean fruit-setting rate of 5 treatments among total 14 ones was 81.57%-93.16.