Abstract: Gravitational wave is an important prediction of Einstein's general relativity,The detection of gravitational wave is one of the greatest frontier area of physics. The gravitational wave astronomy based on the gravitational wave detection is a new area of science. It is a big development and complimentary of traditional electromagnetic radiation Astronomy. The prediction,properties and detection of gravitational wave have been discussed, the working principle and basic construction of laser interferometer gravitational wave detector were analyzed. The main parameters of the gravitational wave event GW150914, its detection and the method of data analysis have also been introduced.