As a typical micro-integrated energy system, the park-level integrated energy system has the advantage of increasing the consumption of renewable energy on site and improving the efficiency of integrated energy utilization through multiple consumptive technologies and multiple storage technologies. In this paper, the daily lowest operating cost and renewable energy maximum consumption of the integrated energy microgrid system is taken as the objective function, and various load balance constraints and system components running constraint are considered, a day ahead optimal operation model is established for the integrated energy microgrid system with external supply, conversion, storage and consumption of various energies including cold, heat, electricity and gas. Based on Yalmip toolbox of MATLAB, optimization algorithms are programmed to apply Gurobi’s business planning software to solve them. By setting up adjustable natural gas pipeline operation constraints and contact line constraints to simulate the various scenes, start-stop plan and output distribution of the units in the park are solved, and the impacts of the external energy supply constraints on micro grid operation are discussed. The effectiveness of the model solving method is confirmed by the optimized results.