Anti-impact gear field test by the real ship of designed typeis conducted to evaluate the reliability and effectiveness of the anti-impact gear of one ship lift chamber.It is found that the ship’s impacting on the anti-impact gear by the ship bow and stern with the designed speed is stopped effectively by the anti-impact beam.With the increase of the impact speed,the oil pressure of the buffer cylinder,the piston rod tension and run-length all increase,and the working characteristics of the anti-impact gear is identical with the design.At the same time,the ship lines and the impaction position are the important factors for the movement of the anti-impact beam,force,buffer time,etc.,therefore,these should be considered in design of the anti-impact gear.