My research interests lie in galaxy formation, dark matter haloes, and their connection to the underlying cosmology. My past research has been devoted to the properties of satellite galaxies, the connection between galaxies and dark matter, understanding the standard cosmology model with faint satellite galaxies, and constraining Milky Way halo mass through dynamical modelling of galactic haloes. These studies were carried out both theoretically and observationally, with experiences in large galaxy surveys, cosmological numerical simulation, gravitational lensing and dynamical modelling.