Abstract: In order to decrease welding deformation, welding sequence of complex welding structures need to be optimized.Welding model of these type structures has been developed with the virtual reality modeling language (VRML).Welding sequence was defined based on user's simple operation and written into procedure file of FEA software Marc' s preprocessing system by script node.By this method, a vivid and interactive welding environment can replace the stuffy and complex processing analysis.It not only provides good guidance to understand complex welding structure and welding preassembly, but also discusses virtual reality and FEA software integration.It also supports welding quality analysis and training welding worker.