Wireless sensor networks（WSNs）which can monitor perceive and gather real-times various information of environment collaboratively and the signals is sent to the host computer for processing.The nodes of WSNs serve the functions of perceiving and routing.Power consumption is the key factor affecting the longevity nodes in practice.The power consumption of WSNs is designed and analyzed.Some methods are given from hardware and software aspects to reduce the sensor power consumption.A low power consumption WSNs nodes are designed and tested.Experment results show that the method has low power consumption

easy to use and other advantages.