Abstract: Black hole is the most mysterious object in the universe, which has only existed in the theoretical hypothesis for a long time. However, with the development of modern astronomy, we have got many evidences for existence of black hole. Especially with
the development of gravitational wave and neutrino detection, we can not only get information from black hole via electromagnetic
radiation but other “messengers”, which marks a new era of muti-messenger astronomy!

Key words: black hole, gravitational wave, cosmic ray, neutrino, muti-messenger astronomy