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PDNS can provide a more accurate and effective simulation of large-scale network topology. How to predict and improve its simulation performance has become a hot topic. This paper analyzes the main impacting factors in the distributed network simulation and on this basis, builds the performance estimation model of distributed network simulation based on PDNS conservative synchronization mechanism in complex environment, and then verifies it through experiments. The results show that the model can accurately estimate the simulation performance of PDNS in the complex environment.