After analyzing the characteristics of disassembly systematically, a multiobjective optimization model that could be employed to generate and evaluate appropriate disassembly sequences in green design efficiently was presented. The hierarchical attributed liaison graph(HALG) was built according to bill of material (BOM) and the knowledge in demanufacturing domains, and the disassembly sequence was generated automatically from HALG through recursively decomposing the assembly into subassemblies. This approach addressed the geometric feasibility of disassembly, the economic value of disassembly, and so on. For more, this approach could be used in the disassembly planning of the complicated products. To verify the validity and efficiency of the approach, the disassembly sequence planning system in green design was implemented and a variety of assemblies including some complicated products were tested, then the corresponding results were presented.