In order to obtain the influence law of the spring stiffness of the elevator hydraulic buffer, the buffer mass and the falling speed of the hydraulic buffer on the cushioning characteristics, the buffer hydraulic resistance mathematic model is established with mass conservation equation and energy conservation equation. The cushion characteristics under conditions of different reset spring stiffness, different buffer quality, different falling speed were analyzed with the method of numerical analysis. The results show that the reset spring stiffness has certain effect on the cushion characteristics but the optimization space is small; the hydraulic bumper can meet the performance requirements under heavy load condition and buffer stroke is shorter but buffer deceleration is larger under light load condition; in the buffering process average deceleration, maximum deceleration, buffer stroke increased with falling speed increasing.