Almost 100 years ago, Einstein predicted gravitational wave right after his discovery of general relativity (GR). Due to the complexity of  the diffeomorphism in GR, people (including Einstein himself) have argued the existence of gravitational wave for quite a long time.Till 1960s, Bondi and his coworkers solved this debate theoretically. In 2015, the first direct gravitational wave detection events was confirmed by LIGO. In this talk, the gravitational waves based on linear approximation and the famous Bondi-Sachs framework will be introduced. Some recent progress on this topic will also be discussed.

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