In order to reduce the wind noise caused by high-speed driving, the principle of door adjustment is: high before and low after.

Before the door of the whole vehicle is completed, comprehensively check the closing situation, the dynamics of the door handle and the looseness of the front and rear doors. When checking, close the door, check whether the gap between the front and rear of the door is equal, whether the door is equal to the body line, and observe whether the door is concave and convex from the side of the door. You can adjust the door when you find any bad situation.