A system for task allocation of a multi-core processor is provided. The system includes a task allocator and a plurality of sub-processing systems. Each of the sub-processing systems comprises a state register, a processor core, and a buffer, the state register is configured to recognize state of the sub-processing systems, and transmit state information of the sub-processing systems to the task allocator, the state information comprises: a first state bit configured to indicate whether sub-processing systems are in Idle state; and a second state bit configured to indicate a specific state of the sub-processing systems. The task allocator is configured to allocate task to the sub-processing systems according to a priority determined by the state information sent by the state registers of the sub-processing systems.