The power system model with reasonable network is needed for PAS. In the current EMS, the correctness of the topology, the completeness of the device parameters and the diversity of the model are not included, which makes PAS analysis unable to execute. Targeting at the disadvantages of PAS network model and its application, a new modeling process design is proposed. The proposed design meets the usage requirements of different PAS applications and heterogeneous operating system platform. In addition, the design is reusable and based on multi-platforms. Software developed based on the proposed design is applied into several China's dispatching control systems. The applications show that the proposed design can meet the requirements of PAS application.