Over the past decade, we have seen a major breakthrough of our understanding of the high-energy universe,
thanks to the sensitive survey performed by the Fermi satellite and Cherenkov telescopes such as MAGIC,
H.E.S.S. and VERITAS. In this talk, I will briefly review the status of these gamma-ray observations,
and present our works on the pulsar binary PSR B1259-63, which is a unique system in the Milky Way.
This system highlights the importance of contemporaneous multi-energy band observations in major
scientific discoveries. At the end of the talk, I'll discuss possible opportunities related to the
upcoming Chinese high-energy experiments such as HXMT and LHAASO.