With knowledge as the power source, enterprise's innovation and transformation has its achievements directly linked to the ability and level of enterprise's knowledge management. In view of this, it is meaningful to evaluate the management capability and level. Targeted at problems existing in the current evaluation process, we studied the corresponding evaluation system and model. Firstly, a discussion was conducted on the connotation of enterprise knowledge management and the positive role of assessment on its ability and level. Then, we analyzed the management problems as well as their impact on our evaluation process. Afterwards, we referred to the evaluation index selection principle, and accordingly established the evaluation system of enterprise knowledge management ability and level. Finally, by combining grey relational analysis with fuzzy evaluation analysis, we built up a fuzzy grey relational comprehensive evaluation model on the basis of an initial decision-making analysis matrix, a normalized decision-making matrix and the weighted triangular fuzzy number distance. The algorithm implementation steps were also listed in the latter part.