It is difficult for a wireless communication in the mobile communication system of the airport environment. The path loss is an important factor to cause the attenuation in the radio signal transmission; however, the impact of rainfall will be more serious. This article that via build the airport module and lots of simulation is to describe airport remote apron wireless coverage if no rainfall,and verify it by using Wireless Insite software. To further study path loss of wireless signal transmission in the different rainfall environments, the relationship between rainfall and path loss can be acquired by matlab the software simulation. It has a certain reference value for predicting the wireless coverage of the airport remote apron in the different rainfall environments.