An evaluation index system of plateau environmental adaptability for internalcombustion forklift was proposed based on the plateau environmental test. A model of fuzzy evaluation for the plateau environmental adaptability of internalcombustion forklift was established by using the analytic hierarchy process (AHP) and fuzzy evaluation theory. An example for practical evaluation was given. The result shows the reliability of the method. It provides a new method for correct evaluation of plateau environmental adaptability of the internalcombustion forklift. 