Abstract: Aiming at the problems of high labor intensity,high damage rate and low harvesting efficiency in the process of yam harvesting,a kind of hanging yam harvester was designed based on the agronomic characteristics of yam harvesting and soil failure criteria.The whole machine is installed on the rear linkage of the tractor.The machine is mainly composed of suspension device,trenching and soil breaking device,soil discharging and backfilling device,vibrating soil breaking device,etc.It could simultaneously realize the functions of soil breaking and trenching,lifting and soil discharging,soi backfilling and separation of yam tubers from soil during yam harvestperiod.Based on the analysis of the working principle of the whole machine,the structural design and parameter determination of the key components were carried out.Through the analysis of the maximum efficiency of soil crushing and the movement of the grid excavation vibrating shovel,the main influencing factors and their values,such as the travel speed of machines and tools,the crank shaft speed and the inclination angle of the vibrating shovel were determined,and a series of field harvest experiments were carried out.The optimal parameter combination of the maximum harvest intact rate was obtained as the followings:crank shaft speed was 306.18 r·min^-1,machine travel speed was 137.85 m·h^-1and vibratory shove inclination was-6.18°.