In the high-frequency vibrating screen,the materials perform simple harmonic motion in the throwing an-gle.The motion of materials on the screen is closely related to the working parameters of the screen.Through reasonable as-sumption and analysis for the materials on the high-frequency vibrating screen,the paper describes the jump conditions of material particles,and analysis calculation for the throwing strength,to determine its value range,which can provide relia-ble theoretic basis for design of high-frequency vibrating screen and improvement of screening efficiency.%在高频振动筛中，物料随筛箱沿抛射角方向做简谐运动。物料在筛面上的运动状态与筛子的工作参数有密切的关系，通过对高频振动筛筛面上物料的合理性假设和分析，简述了筛面上物料颗粒的跳起条件，并对抛射强度进行了分析计算，确定了其取值范围，为高频振动筛的设计及筛分效率的提高提供了可靠的理论依据。
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