Abstract: To deal with the simulation problems encountered in the system design for distributed simulations, an integrated environment based on HLA for collaborative simulation run-time management was provided, by integrating all the simulation tools and simulation applications that complied with the well-documented interface standards. The integrated environment supported both the interoperability of different simulations and the integration of simulation tools, as well as provided simulation run-time management, simulation time management and simulation data management. The integrated environment based on HLA was widely used.