I mainly work on galaxy formation and evolution, galaxy-halo connection and dynamical modelling of the MW Galaxy and dwarf galaxies. When stars are used as dynamical tracers for galactic studies in my research, I have growing interests towards individual stars. More recently, I have been working on a few projects with my students and postdocs, associated with proper motion and distance measurements for MW stars, and binary fractions of stars in dwarf galaxies. I got my PhD. at Shanghai Astronomical Observatory in 2013. Afterwards, I worked as a postdoc at Durham University (Durham Junior Research Fellowship), and at Kavli-IPMU (Tokyo University), before joining the Astronomy department of Shanghai Jiaotong University in 2019.For our Milky Way （MW） and nearby dwarf galaxies, their internal stellar kinematics can be well resolved. In the last 20 years, a series of small-scale crisis that may challenge the standard cosmological model are raised according to observations around our MW, such as the inconsistency between the observed number of MW satellites and theoretical predictions, and the difference between the observationally constrained inner densities of dwarf galaxies and the cold dark matter (CDM) prediction. I will show that current dynamical modeling approachs of dwarf galaxies and MW are still subject to systematics and sample selection effects, followed by our attempt of developing new modeling methods and applications to the latest Dark Energy Spectroscopic Instrument (DESI) Survey data. We reveal that the matter distribution around our MW is highly anisotropic. The inner and outer stellar halos are twisted, with the inner halo more aligned with the disk, and the outer halo more perpendicular to the disk but align with the Vast Polar Strucutre of 11 classical MW satellite galaxies. We find imprints on the stellar halo due to the infall of the Large Magellanic Cloud. For more distant dwarf galaxies, we developed a cross-correlation technique, based on which satellite mass functions down to 10 to the 5.5 times of solar mass are measured, indicating the number of dwarf galaxies is in good agreement with predictions by the CDM model. Moreover, we show that our local Unverse is a 'void' region.