In order to control the height of airport lawn to meet the requirements of safe use of airport environment, a model of the number of mowers in airport was established. The existing problems and influencing factors of airport mowing operation were analyzed. Based on the system dynamics theory, the stock flow chart and mathematical model of airport mowing operation process were established based on the airport lawn area, mower quantity and performance, and airport grass growth. The model was verified by an example of an airport lawn in northern China. The results show that the running results of the model are basically consistent with the actual number of mowers used in the airport and the operation situation, which can provide theoretical basis and technical support for airport managers to allocate the number of mowers and arrange the operation time.