Abstract: 【Objective】 In view of the problems such as high manual operation intensity, heavy workload and short time of flower farming in orchard thinning management, the main parameters of orchard thinning operation are studied and designed, and software is used to optimize the parameters to provide reference for the development and optimization of orchard mechanical thinning management equipment. 【Methods】 Mechanical design, theoretical force analysis, hydraulic analysis, flower thinning performance test, data analysis and optimisation of the combination of methods. 【Results】 The overall size of the flower thinning machine was (2.2×1.7×3.5) m, the length of the flower thinning shaft was 1 m, the length of the flower thinning arm support bracket and the flower thinning arm was 1.8, 1.5 and 1.5 m, the maximum force of the three hydraulic cylinders of the flower thinning arm was 980, 1,450, 3,600 N, and the key parameters in the hydraulic system were calculated, designed and selected. Through the field test verification, the agronomic requirements of thinning were met, the thinning rate under different combinations of parameters was collected, the effect of each factor on the thinning rate was analyzed by design expert, and the parameters of the regression model were optimized. 【Conclusion】 The optimal combination of parameter values for tracked self-propelled flower thinning machine travelling speed is 2.6-3.4 km/h, the speed of the rubber strip is 350-400 r/min, the spacing of the rubber strip for the best results of 5 cm, the thinning rate of 35%-40%; the impact of the test factors on the thinning of flowers is in the following order: the speed of the rubber strip﹥the spacing of the rubber strip﹥the speed of the machine suitable for the modern standards of orchards.