Abstract: For analysising mechanical property of four-bar beating-up mechanism more accuracy, resistance of beating-up on reed was changed into an equivalent torque on rocking shaft, and the varying law of the equivalent torque was simulated by smooth step function, because of those, an effective method used to calculate resistance of beating-up was put forward. Based on dynamics simulation and analysis for the mechanism, dynamic load on loom’s frame was calculated. Boundary conditions was defined through the function of sports load input on Motion module, the dynamic load was transferred to moving link directly, thus the influence for calculating of finite element model which caused by boundary error was reduced effectively. Based on above, the results of statics analysis for crankshaft, connecting rod and rocker were acquired, and a reliable basis was offered to know the mechanics characteristic of the four-bar beating-up mechanism.