Abstract: The software and hardware structure and working principle of the multifunctional measuring-controlling instrument that is applied to evironmental parameters controlling in the greenhouse were briefly introduced in this paper. The new orientating and calibrating method on this instrument was chiefly described. This new method raises the automation and intelligence degrees of its orientation and calibrating, and particularly provides the new technique which makes operating simplier and more reliable in orientating and calibrating on the nominal physical quantity of the nonlinear sensor.