Abstract: The technique of controlling microclimate in growing chamber of greenhouse by microcomputer is a new engineering technique of the adjusting environment which has been developed from the end of 1970s. On the basis of the modles of high yield in cucumber and other vegetables, we have studied for several years on following respects:1. On the hardware, a TP-801 single board computer is used as the main part of the system as a controllor of direct digital. 4 1/2 digital panal meter is used to be A/D converter. The executive apparatus is controlled by the output instruction, which is in the form of O or 1 signals.2. On the software system, we have finished the real time controlling system of adiusting the temperature, humidity, light intensity and CO₂. Including the optimum management programmes of changing temperature based upon the sunshine.In addition, we also have worked out the program of scheduled controlling with 3 or 4 environmental factors in growing chamber day by day. The cultivated experimets of cucumber will be publjshed late.