Abstract: The serial task execution mode is used in most of the existing single-core embedded systems. The system can not respond to other tasks quickly and effectively, during the execution of complex tasks. A real-time multitasking macro parallel software architecture based on single-core DSP is designed by splitting for the complex task, reducing the use of system latency program and querying task marks to scheduling task.The experiment test show that rapid task responding in complex multitasking system can meet the request of instantaneity, stability of the system and multitask parallel at the macroscopic level.