As we know, PLC is more reliable, easy to stall, in highly general use, and could prevent facility from being interrupted well, so it meets our requirements. Here, we choose the S7-300 series PLC and the touch panel TP270 10’’ coming from Siemens. Meanwhile, we take use of Step7 V5.5 and Wincc flexible 2008 to configure them. In the article, we talked more about how to deal with the digital signal and analog signal coming from the field facilities, how to design the supervisory and control system and how to realize the communication among the PLC, HMI, and Field facilities.