Abstract:Engineering machinery basically has several actuators, such as excavators, cranes, etc. It is very often that more than two actuators work at the same time. When the second action is added or reduced, the system is often impacted. A new definition method of the impact value of compound movement was presented. For the commonly used valve back compensation multivalve, the factors affecting the impact were studied, and the methods to reduce the impact were summarized and verified by experiments.