“设而不求”是解析几何中一种常用的重要方法和技巧 ,它能使问题简化 .但如何使用这种方法 ,在使用过程中应注意哪些问题 ,却经常困扰着同学们 .在此 ,笔者愿跟大家谈谈对上述问题的看法与认识 .一、哪些问题适合“设而不求”一般说来 ,解题中涉及到但又不需具体求出的中间量 “Set without seeking” is a commonly used important method and technique in analytic geometry. It can simplify the problem. However, how to use this method and what problems should be paid attention to in the course of use often plague the students. I would like to share with you the views and understandings of the above issues. I. Which questions are suitable for “asking but not seeking”? Generally speaking, intermediate quantities involved in problem solving do not need to be specified.