This paper presents two theorems about odevity, and their application in integral. Some famous integration formula and certain known results can be deduced from these.

• 摘要推广了奇偶函数的概念，给出关于函数奇偶性的两个定理及其在定（重）积分中的一些应用。某些经典的积分定理和一些已知的结论，均可作为其推论。