Trim is one of the basic work that lawn maintains . It is the prerequisite of guaranteeing trim quality of lawn to choose the suitable lawn mower, we can choose type of lawn mower depend on function of the lawn, we should choose the green machine and tee ground lawn mower on green hill and tee ground of golf course;, the best choice is rotary type lawn mower on lane and stadium lawn for instance football ground , Rugby field ,etc.,, reel type of lawn mower is OK for use; should choose the reel types of lawn mower for use on ordinary green land, the view lawn,etc.,; should choose the suspending type lawn mower for use in the slope of golf course ; should choose the brush cutter for use on the forest lawn or the barrier among more lawns