A black hole is a simple but yet complex celestial body. It is simple because a black hole can be described by three basic physical quantities, mass, angular momentum, and charge; and most black holes may not have a net charge. It is complex because the black holes that we observed have a variety of forms, but their causes are difficult to understand.It is believed that there is a supermassive black hole in the center of most large galaxies. Observations found that the mass of a supermassive black hole is roughly proportional to the bulge of the galaxies, suggesting that the formation of supermassive black holes is related to the formation of galactic bulge. However, galactic evolution theory suggest that the formation of galaxies is dominated by dark matter. So it is interesting to ask whether the formation of supermassive black holes is also related to dark matter?Furthermore, the observed luminosities of high-redshift quasars are very huge.