Abstract: Based on the analysis of the difference between the pressure and mass flow dynamic balance processes of the gas pipeline, the gas pipeline was decomposed into a limited number of small-scale equal lengths. The tube element, on each tube element, applied an improved Line-Pack model that took into account the time difference between pressure and mass flow balance, and approximated the complex motion of natural gas in the gas pipeline to a gas-stable motion of a limited number of tubes. The improved Line-Pack model, which took into account the multi-scale long gas pipelines of gas networks, was incorporated into the optimal scheduling model as a constraint, and a linearization scheme was proposed to adapt to large-scale problem solving. The modified Belgian 20-node natural gas system and IEEE 39-node power system were used in the example. Pipeline Studio commercial oil and gas simulation software was used to simulate the scheduling scheme calculated by the proposed model, and the rationality and effectiveness of the proposed improved model were verified.