The invention provides a method of transmitting a message between a TBOX terminal and a TSP platform. A secure encryption chip master key is generated; the secure encryption chip master key is stored to the TSP platform; the secure encryption chip master key is programmed to the TBOX terminal; a communication channel between the TBOX terminal and the TSP platform is built, and authentication is carried out according to the master key. Mutual message transmission between the TBOX terminal and the TSP platform is carried out, the phenomenon that communication data are cracked and leaked and a vehicle is controlled maliciously when the interaction process between the TBOX terminal and the TSP platform is attached can be prevented.