复合函数主要是指函数间通过运算法则进行联系后所形成的新的复杂函数。理解其定义域求法不仅对于解题具有直接贡献,更能够对于后续图像的理解、其他问题的分析提供一定的帮助。本文系统总结在实际学习过程中所遇到的复合函数定义域求法,并试图分析定义域对其解题的意义,希望能够为后续的学习与研究提供一定的帮助。 Composite function is mainly the function of the formation of the new complicated function formed by the algorithm. To understand its domain finding not only has direct contribution to problem solving, but also can help to understand subsequent images and analyze other problems. This paper systematically summarizes the domain of the complex function encountered in the actual learning process and attempts to analyze the significance of domain definition to solve the problem, hoping to provide some help for the follow-up study and research.