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The precise feeding system and relevant key technologies, including RFID, network based on ZigBee, measuring technique etc, are discussed. The precise feeding system is composed of central computer, precise feeding devices and wireless network used to build up the distribute system. The core of the precise feeding device for dairy cattle is identification of individual dairy cattle. The RFID, a non-contact identification technology, is integrated in the system. The electrical ring made according to ISO11785 international standard is worn by individual dairy cattle to identify each dairy cattle. The information of the cattle is checked by the system and then certain amount of forage is given. On the course of intake, all feeding data are collected by the system such as the unique electrical code, actual intake of forage, feeding time, feeding velocity, etc. The feeding formula is given by the program running on central computer connected to precise feeding device by ZigBee network. Some interfaces of system are reserved for the extending function so that it will be easy to update system. The precise feeding system can provide a solution of high efficiency and high benefit for dairy farming.