The United States project LIGO (Laser Interferometric Gravitational-Wave Observatory) made a direct observation of gravitational waves for the first time in human history, and has also announced second event recently. These gravitational wave sources certainly to be the larger mass black-hole of 10~30 solar mass. Beyond the success of many years of challenges in a direct measurement, these gravitational waves show the possibility of new physics studies, e.g. on the origin of such BH binaries, testing general relativity, explore the cosmology, etc.