引力波探测获2017 年诺贝尔物理学奖意味着这一探测是对爱因斯坦广义相对论的一个重大验证，也是开启引力波天文学新时代大门的钥匙.因此，让具备大学物理知识的教师、学生和一般读者了解引力波理论的知识是重要的.本文介绍了广义相对论下的引力波理论.在弱场近似下，介绍了如何计算双黑洞绕转所辐射引力波的振幅，以及chirp 质量和引力波频率的关系.

Gravitational wave exploration won the 2017 Nobel prize in physics，which means that this probe is a major verification of Einstein's general relativity，and is also the key to open the new era of gravitational wave astronomy. Therefore，it is important for the teachers，students and general readers to have a knowledge of the theory of gravitational waves. In this paper，the theory about gravitational waves is given with general relativity. We introduce how to calculate the amplitude of gravitational waves for binary black holes which rotating with each other.We also introduce the relationship of chirp mass and the frequency of gravitational waves.