Abstract: The motion of solid particle in vertical pipeline is a very complicated physical procedure.The paper analyzes the forces acting on the micro unit，and builds the dynamical model of the solid particle in vertical pipeline.Photos are taken when the particles are in the ascent stage and the aerosol stage with the high speed camera.Based on this，the motion path of the solid particle is obtained，and the motion law of particles is explored as well.

Key words: Solid-liquid two-phase flow, Vertical pipeline, Particle motion, Hydraulic lifting