Exploring reasonable valve seating rules is an important measure to improve the reliability of the valve. The hydraulic drive valve AMESim simulation model was established. Through discussion on engine speed and key structural parameters, the results show that: reasonable engine speed causes the valve more stable seated; conical annular gap buffer can not only reduce seating velocity, but also affect valve seating velocity fluctuation; if the valve quality is too large,the valve cannot seated stably; valve spring preload will influence the valve seating velocity but will not damage the valve.It provides reference for the requirements of valve seating.