In the proceeding, first we will summarize results of our recent observations for gamma-ray binaries hosting Be star, HESS~J0632+057 and PSR~J2032+4127/MT91~213. For HESS~J0632+057, Moritani et al. proposes a new binary parameter, which is smaller system size and smaller eccentricity comparing to the previous results. PSR~J2032+4127 is the new gamma-ray binary confirmed by the VERITAS and MAGIC collaborations. We report the evolution of the optical/UV/X-ray light curves as the pulsar approaches to 2017/2018 periastron passage. We discuss the temporal variability of the emission from the gamma-ray binary with the pulsar binary model, and apply the discussion for the X-ray light curve of PSR~J2032+4127/MT91~213 to investigate the evolution of the magnetization of the pulsar wind.