Gaia space telescope is a very important project of the European Space Agency and is a follow-up project of the Hipparcos space telescope. It was launched in December 2013, arrived at the second Lagrange point of the Earth Moon system a few weeks later, and began a five-year sky survey mission in mid August 2014. Its main goal is to measure the three-dimensional space and three-dimensional velocity distribution of stars to determine their astrophysical properties, such as surface gravity and effective temperature, to describe and understand the formation, structure， history and evolution of the Milky Way. On 13 June 2022, Gaia Data Release 3(Gaia DR3) is released. The Gaia Early Data Release 3 (Gaia EDR3) released in October 2021 mainly contains the position, magnitude, proper motion and parallax of 1.5 billion stars, as well as the pseudo color information of some stars with poor photometric quality. Gaia DR3 neither contains new astrometry nor new photometric calibrations, thus, the photometry and astrometry data are common for DR3 and EDR3. However, DR3 has added more data on astrophysical parameters, such as spectral related parameter data, variable star list, and data on celestial bodies in the solar system. For the first time, there is data on the source of expansion (such as galaxies and quasars).