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PLC and PROFIBUS on-the-spot bus with their of simple structure, expenses low easy to maintain , dependability high , opening ,etc. many kinds of advantage become focus of automatic field day by day technology, control with a great deal of advantage its field cause a epoch-making change in industry. This text has introduced the current situation of the development of the on-the-spot bus at first, connect the on-the-spot equipment of intelligence and two-way digital communication technology of controlling the equipment, bus live have opening and person who operate each other, some control function must following to move get on-the-spot equipment, then detailed to PROFIBUS on-the-spot bus technology. Network structure and software and hardware introducing it in detail finally are designed, and carried on research to some main control problems among them . Use STEP7 software write good procedure respectively among S7300 and S7400, through can programme procedure that controller finish in advance control, control through is it exchange to touch off time to change the voltage of controlling voltage regulator to change, form the best temperature failing to control the electric stove of control amount. PROFIBUS and Ethernet realize transmission of data, utilize configuration software in go to location produce configuration picture on the plane and touch-sensitive screen, realize the long-range control of the temperature of the circuit. Keywords: PROFIBUS Fuzzy control Siemens PLC Ethernet