Abstract: Motion and force analysis for conveyed material was conducted when the fruit crusher was working and produced pressure on the screw conveyor. According to the method of global vectors, the kinematics and kinetics models of material particle in the processing of screw extrusion were founded. It solved the velocity of material particle and torsion of the screw conveyor and analyzed influence law of different parameters on velocity and torsion with the help of Matlab in the paper. It can not only provide a theoretical basis for fruit crusher working and design parameters, but also can provide a theoretical references for screw extruder and screw machine design parameters.