本文作者从理论与实践的结合上研究航班计划优化问题，从我国国情出发建立了数学模型，指出其系数矩阵具有稀疏性和非零元素具有对角方块结构。以盈亏平衡客座利用率为依据，把大型问题的线性规划最优解整数化，使航班计划优化具有可操作性。 Based on the combination of theory and practice, the author studies the problem of flight planning optimization. Based on the national conditions of our country, the author establishes a mathematical model and points out that the coefficient matrix is ​​sparse and the nonzero elements have diagonal square structure. Based on the utilization ratio of break-even customers, the linear programming optimal solution of large-scale problem is integerized so that the flight plan optimization is feasible.