Abstract: The Sun is our star, the nearest star. The solar coronal mass ejection (CME) is one of the most violent activities in the solar atmosphere. When a CME takes place, it releases 1015-16 g of plasma from the low corona into the solar wind, to disturb the near-Earth space and hence bring adverse consequences if the CME is directed toward us. In this paper we present a brief summary of our current understanding of the origin of CMEs. We believe that it is the twisted magnetic field that stores enough free magnetic energy for a CME to erupt. We argue that the accumulation of magnetic helicity in the corona plays an important role: not only will it bring in free magnetic energy storage as a natural result, but also it will result in a CME-type eruption as an unavoidable event in the process of a coronal evolution.