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The wireless sensor network is one new hot spot for both research and industry. Currently several communication protocols have been developed for wireless sensor network, including Zigbee, wirelessHART, ISA100.11a, WIA-PA, and so on. Most of these protocols are developed based on IEEE 802.15.4. IEEE 802.15.4 was designed for low-cost and low-power wireless network which provides MAC layer and physical layer specification. In this paper, the performance of IEEE802.15.4 is analyzed based on NS-2 simulator. According to the simulation results, Performance is analyzed for different application requirements, for example, the packet reception ratio over different sending interval time, the packed routing load over different sending interval time. etc.