Aiming at the structural characteristics and motion characteristics of the clamping mechanism in double-bend-type injection molding machine, a testing methodology for investigating the movement mechanism of the clamping process was proposed, in which the movement was simulated by AMESim. At the experiment of clamping process, the hydraulic shock at each point of the hydraulic system and the vibration data for mold clamping mechanism were measured with various flow setting, different pressure settings and flow rate parameters. Through the analysis of the test results, the effects of different pressure, flow and other parameters on the impact vibration and motion cycle were obtained. When the flow rate increases, the time required for the clamping process decreases; the vibration amplitude decreases first and then increases; the pressure has little effect on the mode cycle and vibration reduction.