The supercritical accretion flows are thought to exist in some AGNs/QSOs and contribute to the growth of the supermassive blakc-holes. However, the physics of the supercritical accretion has poorly been attempted (Eggum 1988, Okuda 2002). We investigate the supercritical accretion flows by 2D radiation hydrodynamical simulations. It is found that the black-hole can rapidly grow due to the violent mass accretion. Then, the observed luminosity is much less that the dissipated luminosity, since the huge amount of the radiation energy is swallowed in the central black-hole with accreting gas (Ohsuga et al 2002, 2003).