Abstract
The first directly detection of gravitational wave (GW) opens the new era of astronomy: the gravitational wave astronomy. I will briefly introduce the role of high-frequency GW signals in studies of multi-messenger joint observations, EOS of NS and cosmology. I will present a Bayesian approach to multi-messenger astronomy and its applications on GW-host galaxy and GW-short gamma-ray burst. The strong lensed GW-EM system as an astrophysical probe, especially on measuring the GW speed and constraining cosmology parameters, will also be discussed.
