The Fermi Gamma-Ray Space Telescope has been monitoring the whole sky in the energy range of 0.1—300 GeV for more than 10 year since 2008 August. Its great capabilities allow not only to have detected more than 5000 high-energy sources thus far, but also to have carried out detailed studies of different types of objects. In this talk, I will present the results from our recent studies focusing on analysis of Fermi data for gamma-ray binaries and blazars. In the classical gamma binary LS I +61d303, we find evidence for a non-axisymmetric circumstellar disk of the Be companion. In the well-known Galactic micro-quasar SS 433, we detect the emission due to the interaction of its jet with the ambient medium. And in the blazar PKS 2247-131, we find a month-long QPO during its outburst, which likely indicates a helical structure in the jet. In the end, I will briefly introduce the coming Chinese LHAASO and international LSST surveys; combining with their results, we will be able to explore the variability of the high-energy objects at multi-wavelengths and provide answers to some key questions.
