There are still many problems to be solved in the management of the city's lawn. This article studied the impact of mowing and removal of weed on lawn growth. The result indicated that mowing was more effective than removal of weed in preventing other grasses from overgrowing and helping the main grasses grow better, keeping the lawn tidy and beautiful, and maintaining a high coverage, and it would eventually help to save labor and money in the lawn management. Several proposals were put forward for the management of city lawn.