To improve the credibility and reduce the repetitive work of modeling and development of simulation system, the architecture and technical methods of simulation integration based on installation software are studied and designed. These methods take installation software including middleware as a simulation node to participate in the simulation system. It enables installation software interact with simulation platform using the standard of HLA interaction class, and also unifies the time management strategy. According to these methods, the installation software can join the simulation platform as a member of simulation federation to perform simulation tasks. The application of simulation system which constructed by installation software is used to illustrate the feasibility of the technical methods.