Abstract: This paper analyzes the defect of conventional controlling algorithm and suggests to apply fuzzy controlling algorithm to modern greenhouse environment parameter testing. Firstly, the function of fuzzy language and grade value of input output variable were determined. Then the software and hardware of the fuzzy controlling algorithm. Through fuzzy operating and adopting the approach of software query on controlling, a total controlling table was finally obtained. The experiments indicated that it was an effectively controlling model by applying the fuzzy controlling algorithm to modern greenhouse environment parameters testing.