Abstract: According to the trend of micromation,intellectualization and networklization of sensor,the hardware and software design method of a TCP/IP-based intelligent sensor is discussed in this paper by analyzing the structure and characteristics of the networked intelligent sensor.The experiment results demonstrate a satisfying performance on measurement and network communication of the sensor by using this method.The intelligent networked sensor has been utilized successfully in the measurement and control system of environment factor in agriculture modernization of Guangdong province.