Aiming at the problems of small volume, multi-model, complex assembly process and high precision requirements of aircraft parts assembly products, the research on virtual assembly technology based on VR is carried out. So that workers can plan assembly process and path of the products, select the fixture and operation method to verify the rationality of the assembly process design, timely detect various design flaws in the process, structural interference and other issues, intuitively scientifically analyze assembly operability, visibility, reachability before producing. According to the simulation of virtual simulation, modification and optimization of technological methods, tooling structure and production line layout, a scientific and rational product assembly process program to shorten the assembly cycle, reduce assembly costs and improve the quality of parts assembly is ultimately generated.