Abstract: In the paper a conservation form mathematical model is established, based on the analysis on real gas flow in pipeline. In the light of the model, the implicit method of dynamic emulation and the calculating method of static emulation are discussed. Becaucse the unsteady-state flow in gas pipeline usually belongs to the slow transient, so that the time step-length of emulation can be elongated with the implicit method (with two-degree precision) used at the time of static emulation. Meanwhile, the dynamic and static emulation software-EGPNS of gas pipeline network system has been developed by using sparse matrix programming. This software is suitable to emulation for gas pipeline systems of many kinds, and its main functions cover as follows: demonstrating design project of pipeline system, correcting project and operating project, determining the branch pipelines to be needed or the power of compressor to be needed in the pipeline system; evaluating the peak shaving program; analyzing the accident state and making an analysis on the sensitivity.