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An efficient method is introduced for generating assembly precedence constraints on three-dimensional (3D) models based on a block sequence structure, with the purpose of enhancing the simulation quality of assembly precedence constraints and reducing the development cost of virtual assembly (VA)/virtual disassembly (VD) software. Firstly, we propose a block sequence structure to store and process the attribute data characterizing assembly precedence constraints and the reference variable of paths. Then the approaches to convert a block sequence to the next state for controlling the subsequent VA/VD operations are expounded. In the random-access memory, each assembly reference object is regarded as a node for distributed management of the precedence constraints of its paths. Therefore, the tedious preprocessing for each part model is not required. Meanwhile, the VA/VD process can be flexibly …