To know whether the washing machine is flat, a simple and accurate way to adjust the washing machine is to put some water in the washing machine bucket, put it in half, observe whether the horizontal plane is tilted, if you can not determine, find a rope to measure the distance between the horizontal front, after, left and right directions and the upper edge of the bucket, the distance is low and needs to be raised. When you're done, tighten the screws at the four corners.