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In order to reduce the power consumption of the Wireless sensor network, which directly determines the lifetime of the wireless network, based on the analysis and comparison of the performance of various microprocessor chips and radio frequency chips, mSP430F2618 and CC2520 are selected to design a flexible wireless network node based on the independent architecture of microprocessor and wireless module. The energy-saving strategies of microprocessor, RF chip switching between work mode and low power mode, and microprocessor clock control are proposed. Based on these, the software system of network routing node and end node is designed. The experimental results show that the operating and resting currents (26.0 ma, 1.57 a) of the designed nodes are significantly lower than those of the traditional Imote nodes (35.1 ma, 3.6 a) and Mica2 nodes (56.2 ma, 21 a) when the transmitting power is 0 DBM and the Data transfer rate is 1 MHZ. When the battery capacity of the node is 2700mah and the working cycle is 10 minutes, its life cycle is 7.2 months. The life of the designed node achieves the expected goal.