Based on the theoretical research on the combined operation of the ventilation system of the mine ventilation system, the two main ventilation fans of Shuguang Coal Industry were studied by means of two-wing diagonal parallel ventilation. The theoretical and mathematical calculations were made. The characteristic point curve and parameter expression of the operating point are used to sort out the interaction expressions of changing the air volume of the fan to the air volume and wind pressure of other wind turbines and the shared wind tunnel, and effectively determine the diagonal parallel of the mine fan for the scientific research of Shuguang Coal Industry. The theoretical basis for the effects of each other.