The embodiment of the invention discloses a hybrid-mode-based control optimization data communication method and system of an ABB system. Technical problems that the efficiency is poor because of usage of a single communication way in the ABB system and the internal operation of the ABB system may be affected can be solved. The method comprises: corresponding data in an OPC server side are received according to a preset data point table by an OPC client and are sent to an optimization software host; and optimized data in the optimization software host are obtained according to a preset optimized data point table by an MODBUS host and the optimized data are written into an ABB control system.