  We will summarize some aspects of the standard model Higgs boson at high
energy $\gamma\gamma$ colliders, where the photon beams are realized by the
laser backscattering method, including the direct Higgs boson production via
$\gamma\gamma\rightarrow H$, and the measurement of the Yukawa coupling via the
channel $\gamma\gamma\rightarrow t\bar tH$.
