The efficiency and the parallelism of parallel discrete event simulation can be improved through simulation cloning. Analysis, comparison and evaluation of what-if can be processed quickly and conveniently. Generalized Multi-Scenario Analysis Simulation (GMSAS) concept was given. Based on the introduction of simulation cloning and the analysis of the deficiency on current simulation cloning, the out-place cloning was proposed to advance the efficiency of GMSAS. It was implemented on checkpoint/recover in dynamic parallel simulation engine. An experiment was carried out by using Phold testing program. The results of experimental research demonstrate that the whole efficiency of GMSAS system is improved through out-place cloning.