In order to ensure the safety of the plateau flight route and the availability of the emergency procedures for single floating landing and cabin pressure relief descent under abnormal conditions, the “Xining/Caojiapu-Yushu/Batang” plateau flight of Airbus A319-115 was taken as the study sample.In accordance with the route information displayed in the 202108 Issue of the Civil Aviation Industry of China (CAAC) Domestic Aviation Data Compilation, which was implemented at 00:00 on August 12, 2021, and by sorting out the basic data of airlines and meeting the requirements of relevant regulations, overall consideration was given to the safety, efficiency and service needs of airlines. To complete the design and research of emergency procedures for single-engine floating descent and cabin pressure relief emergency descent, the research group optimized the decision points of relevant emergency procedures and finally defined the operation procedures of the unit. The research shows that by determining the key points of emergency procedures, defining the crew operation procedures of the unit after flapping and pressure relief, and completing the drawing of the profile diagram, the purpose of safe flight in emergency situations can be achieved. This research achievement has popularization significance in similar plateau airlines.