Abstract: Assembly constraints present important information of assembly in virtual disassembly environment. A dynamic management mechanism of assembly constraints is put forward, and based on the navigation of assembly constraints, virtual disassembly under the virtual environment is realized. The dynamic management mechanism of assembly constraints comprises acquisition and representation of assembly constraints in the virtual environment and dynamic maintenance of assembly constraints, which includes deletion and generation of assembly constraints during disassembly. In this paper, assembly constraints are represented using an assembly constraint graph. An indirect deletion method of assembly constraints is presented. The disassembly directions of parts can be obtained by constraint reasoning. In the end, a simple assembly is disassembled, which is taken as an example to verify the proposed method.