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In view of design characters of CCBII brake, a state monitor system based on multi-hierarchy evaluation architecture and fuzzy evaluation method is given. Block diagram of brake state monitor system is given, and design features and functions of each part are described, design methods of factor set, safety degree set and itpsilas criterion in multi-hierarchy evaluation system are discussed. Key points in multi-hierarchy fuzzy evaluation method are deduced essentially, such as diagnosis matrix based on weight set, subordinate degree matrix and multi-hierarchy fuzzy evaluation matrix based on weighted average model. Finally the whole CCBII Brake performance evaluation results are given. The application result shows that the system fits the design features of CCBII brake very well and is available for improve the operational efficiency in depot maintenance.