My main research interests are new physics (especially supersymmetry) phenomenology and the correlated cosmic dark matter, Higgs physics, and top quark physics. My research contents include the following: (1) New physics phenomenology, especially low energy supersymmetry. We examine various direct and indirect experimental constraints on the new physics models, and study their phenomenology at the colliders like Tevatron, LHC and ILC. We perform MC study for the searches of new particles at the colliders. (2) Dark matter, especially the dark matter physics in low energy supersymmetry. We interpret the cosmic dark matter as the LSP in supersymmetry, and try to explain the WMAP relic density and the Pamela results. Then we analyze the required parameter space and study the implication on the phenomenology at the colliders. (3) Higgs physics. We study Higgs physics at the colliders, predicted by various new physics modles like supersymmetry and little Higgs theory. We perform comparative study for different new physics models and compare with the standard model predictions. (4) Top quark physics. We use top quark as a window for new physics and study the new physics effects in various decay and production processes of the top quark, especially the FCNC processes, which are extremely suppressed in the standard model and thus can be served as a smoking gun for new physics.