航天器可重复使用防热结构通常需要采用数值模拟，进行外流场和结构热响应的耦合计算。本文针对前缘类热结构的差分计算中，关于不规则（不能用初等函数表示）区域的热响应计算，应用流场计算的思路，探讨了任意坐标变换和代数网格的生成。给出了有关控制方程、边界条件的处理方法，为进一步耦合计算提供了有关基础。 Spacecraft reusable heat-resistant structures often require numerical simulations to calculate the coupling of the outflow field and the structural thermal response. In this paper, in the differential calculation of the thermal structure of the front edge, the calculation of the thermal response in the irregular (can not be expressed by the elementary function) region is discussed. The calculation of flow field is used to discuss the generation of arbitrary coordinate transformation and algebraic grid. The control equations and boundary conditions are given, which provide the basis for further coupling calculation.