Communication method of application layer in CAN bus system

The invention discloses a communication method of an application layer in a CAN bus system and relates to a network bus in the field of controllers. The communication method comprises the following steps: taking a virtual data object on the CAN bus as a target recognition unit, and taking a data object table as reference for explaining the actual meaning of the virtual data object, the authorities of reading and writing and the data type thereof; and the protocol communication ways of the application layer comprise the ordinary communication way and the boost communication way. The communication method is simple, practical and conductive to promotion and transplantation, has low requirements on a memory of a device and the calculation speed and can be applicable to a large number of industrial automatic process devices using the CAN buses.