The paper discusses the regularity of optimum point for resection operation within an angle or a triangle, and points out some misapprehension used in resection operation and in following some standard.

• 摘要文章分析了在一个角度和一个三角形中进行后方交会时最佳点位的规律，指出某些规程中有关后方交会问题的不足之处。