Abstract: Through complementary and cascade utilization of energy, urban energy internet system can effectively integrate energy resources, which plays an important role in the revolution of energy production and consumption. One of the keys to the construction of the urban energy internet is to establish the comprehensive energy system of the urban industrial park. In this paper, a comprehensive energy system of an industrial park with electricity, heat, cold, natural gas, and other energy flows is modeled to serve the overall planning of production and living load. Combined with the energy storage of the system, a day-ahead operation optimization scheduling model is proposed. The energy storage of energy supply networks and energy storage tanks and their impact on economic benefits are comprehensively considered in the model. The industrial park which relates to production and living energy is optimized, and the energy storage capacity of energy supply networks is quantified. This technology has been applied to an industrial park to optimize the operation of heating conditions in winter. The output optimization of the heat storage tank increases the flexibility of equipment combination in the system, and the thermal inertia of heat supply networks stabilizes the unit output. The optimized plan shows better economy and output stability, saving 1 445 yuan of operation cost per day.