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通过探讨爆后岩石块度与工效成本的关系，提出了使用最佳破碎抵抗线进行爆破设计以获得理想的块度，并给出了最佳破碎抵抗线的表达形式。在此基础上，采用孤形临空面的假设，利用函数极值法得出了孔网参数ｍ的优化取值为３．２２，应用爆炸的不可压缩流体理论解释其力学涵义，最后通过太旧公路的爆破工程实践验证其合理性和可行性。
By discussing the relation between the rock mass and the work efficiency cost, the blasting design using the best crushing resistance line is proposed to obtain the ideal block degree, and the expression form of the optimal crushing resistance line is given. On this basis, using the assumption of the arc-shaped surface of the solitary shape, the optimal value of the parameter m of the hole network is obtained by using the extremum function method. The optimal value of the parameter m for the hole network is 3.22, and its mechanical meaning is explained by the incompressible fluid theory of explosion. Finally, The blasting engineering practice of the old highway verifies its rationality and feasibility.