A multigranularity and hierarchy disassemblability evaluation model was constructed based on complex products′ hierarchical structure, which not only described the evaluation indices from product level to design units level but also presented the methods and rules to quantify the indices. Disassembly entropy was introduced in product’s coarse granularity evaluation. And evaluation matrix was constructed by assigning timebased numeric indices to each design factor. In order to reduce the dimension of the evaluation matrix and eliminate the information redundancy of the evaluation indices, the comprehensive evaluation of disassemblability for design units was carried out by principal components analysis(PCA).By analyzing the evaluation results, feedback was provided to guide the design, disassembly and recovery.A fullautomatic washer case illustrateds that the method is feasible and effective.