By means of infinite series and Parseval equation,a method for calculating a class of generalized integral has been devised and a precise value of generalized integral derived.

• 运用无穷级数和 Parseval等式 ；给出了一类广义积分的计算方法 ；并导出了一个广义积分精确值 ；同时得出了几个常见正项级数的和 .