分段函数是函数大家族中的一个重要成员,由于它具有特殊表达形式与其特殊的考查功能:函数分段给出,可以为多种函数的综合提供一个连接系统,可以重点考查分类讨论数学思想方法,从而倍受高考命题者的欢迎.所以,在高考中出现的频率很高.基于此,我们非常有必要对分段函数问题的解法作一个归纳,以提高对分段函数问题的破解水平. Piecewise function is an important member of the large family of functions. Because of its special form of expression and its special examining function, the function of subsection can give a connection system for the synthesis of many kinds of functions, Method, and thus much acclaimed college entrance examiner.Therefore, the college entrance examination appeared in high frequency.Based on this, it is very necessary for us to make a summary of the solution to the problem of piecewise function, in order to improve the crack level of the piecewise function problem .