The Milky Way bar and its impacts on the kinematics of the disk stars, as revealed by Gaia

European Space Agency (ESA)'s Gaia mission is providing the position, parallax and proper motions for more than one billion stars with unprecedented accuracy and radial velocity for about 30 million bright stars, which has revolutionised our view of the Milky Way. Gaia data have revealed the velocity sub-structures of the Galactic stellar disk in the large range of radii, including many diagonal ridges in the Rgal vs. Vrot map. These kinematical features indicate that the Galactic disk are heavily perturbed, and opened up the new topic of Galactoseismology to study what is causing these features and how we can learn the nature of the Galactic structures from these features. We discuss how the bar and spiral arms are impacting on these kinematical features and how these features can tell us about the nature of the bar and spiral arms in the Milky Way. We also introduce the upcoming near-infrared astrometry mission, JASMINE, which will provide the Gaia-level astrometry for the stars in the Galactic centre region as well as an ESA M7 candidate mission, HAYDN, and the future ESA L-mission candidate, GaiaNIR, which will allow us to study Galactoseismology in the next level