With the continuous growth of the urban population and the continuous development of the internet, the demand for express delivery to residents living in high-rise apartments is increasing. However, the existing logistics facilities and products can not solve the transportation problem of the last distance from the apartment door to the consumer's room.This individual sealed express delivery transportation will become important for more and more people in the future. CERT is an express transportation system for the transportation from outdoor to indoor in the last kilometer of express transportation.