A novel evaluation method for design schemes was presented by combining information axiom and fuzzy membership function. The presented method did not have to give the weight of evaluating indicator, and thus the effect of subjective consciousness of the designer to the result of evaluation could be avoided. At the same time, the scheme evaluations were classified according to the true instances. The information content of qualitative indicators are hard to calculate when just applying the general information axiom, but was solved by using the fuzzy mathematic theory for design schemes evaluation. At last, the scheme evaluation of the mechanical driven system of decelerator was presented to illustrate the effectiveness of the proposed approach.