In order to ensure the safety, reliability, economy and comfort of aircraft environmental control system, the method of sensor installation is proposed. By analyzing the position and function of the commonly used sensors in the environmental control system of the mainstream transport aircraft in the world, the most representative Boeing737 aircraft and Airbus320 aircraft are selected for comparative study, and the general method of sensor setting in the environmental control system of aircraft is summarized in combination with the airworthiness standards related to the environmental control system. The accuracy and range of measurement are also described. The results show that the study can provide a reference for the selection and design of sensors in aircraft environmental control system.