To apply the basic idea of probability to the computing of real infinite integrals, to find that this method is more simple, convenient and widely used than the Small Arc Lemma.

• 摘要将概率的基本思想，应用在计算实无穷积分中，结果表明该方法与小圆弧引理相比，计算更为方便简单、适用范围更为广泛。