Based upon main indexes of Chinese key enterprises for electric furnace process of steelmaking, with primary component analysis and multiobjective fuzzy comprehensive evaluation method, electric furnace overall level of production of 16 key enterprises have been evaluated.

, the multi target fuzz comprehensive analysis method is proposed.

Viewed from competency, the construction of competency integrative index system of Black Belt are studied in this paper, the paper presents a fuzzy multiple index evaluation method, then proposes a new view of Black Belt Selection.

Then,based on the system, a fuzzy multiple index evaluation method for the ability of knowledge managers is presented.

Then, a fuzzy multiple index evaluation method is presented.

Through building a closed-funds performance evaluation system,the paper build a evaluation model——Multiple Objective Evaluation Model and make a demonstration study of L closed-funds performance in china,then it gets a list of the of the place in performance.

Through analyzing the influence factors of surrounding rock stability of tunnel and the importance of various factors,the multi-objective variable fuzzy evaluation method of the classification of surrounding rock stability based on variable fuzzy set theory is deduced.