思维品质是指个体思维活动特殊性的外部表现,它包括思维的严密性、思维的灵活性、思维的深刻性、思维的批判性和思维的敏捷性等品质。函数作为高中数学的主线,贯穿于整个高中数学的始终。函数的定义域是构成函数的两大要素之一。函数的定义域(或变量的允许值范围)似乎是非常简单的,然而在解决问题中不加以注意,常常会使人误入歧途。在解函数题中强调定义域对解题结论的作用与影响,对提高学生的数学思维品质是 The quality of thinking refers to the external manifestation of the particularity of individual thinking activities. It includes the qualities of rigorous thinking, flexible thinking, profound thinking, critical thinking, and agile thinking. Function as the main line of high school mathematics, runs through the entire high school mathematics. The function’s domain is one of the two major elements that make up a function. It seems as if the function’s domain (or range of allowed values ​​for variables) is very simple, however, it is often misleading to ignore the problem. In the function of solving problems, it emphasizes the role and influence of domain definition on the solution of the problem, and is to improve the students’ mathematical thinking quality