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Compared with the general embedded system, the operating system for wireless sensor networks is more constrained in the aspects of energy efficiency, real-time performance and multitasking. Being aimed at these features, a real-time operating system based on event-driven is proposed for wireless sensor networks application. A thought of hierarchical structure is adopted to build the modular system components which contain memory management, event management and task management. Simple and effective memory management is achieved using the memory control block dynamic list. The low power dissipation and preemptive task scheduling is implemented based on event-driven and task priorities. The experimental result shows that the system has low power consumption and good real-time quality.