With the rapid development of the computer technology,applications of computer in agriculture productive become more and more.It has more applications in the field of greenhouse temperature control.Designs a greenhouse temperature control system based on AI708P appearance.With AI708P appearance,this temperature data delivered by temperature sensors located from different place in greenhouse is provided to computer by the way of serial port communicate.And in this system,it can automatically adjust the greenhouse temperature,thereby it come to true that the monitor and control of greenhouse temperature.