Abstract: In this paper,a microcomputer system for monitor and control the air and soil tempereture,humidity and luminosity of greenhouse environment is introduced. This system use IBM-PC as a store data unit and MCS-51 or SDK-86 as monitor and control unit.The system hardware is composed of main module,seasor and A/ D transformer, Data collector, Output control,Display and Print modules,all of these are illustrated. The working principle,main control program and the results of try out also are discribed.With multi-channel I/O, independently control eight greenhouses and six phases of temperature have been real-ized.So it is especially suitable for environment control of multi-greenhouse.