ACARS is a two-way airborne data communication system based on VHF (Very High Frequency), which provides services for air-ground and ground large-flow data communication of airlines and realizes the exchange of various information. On the one hand, it can automatically provide real-time data information such as flight dynamics and engine parameters to the airline ground application system without crew intervention, and at the same time, it can also transmit other kinds of information to the ground, so that the airline operation control center can obtain a large number of real-time and uninterrupted flight data and aircraft related information on its own application system, grasp the company's aircraft dynamics in time, realize real-time monitoring of the aircraft, and meet the management needs of navigation, operation and maintenance and other related departments; On the other hand, the ground can provide meteorological information, route information, air emergency troubleshooting measures and other services to aircraft flying in the air to improve flight safety and service level for passengers. Under the condition that the commonly used VHF ground-to-air communication channel is increasingly saturated, the information transmission volume is small and the speed is slow, this two-way data communication system can significantly improve and improve the ground-to-air communication support capability.