中文摘要：

太阳是离地球最近的一颗恒星，太阳日冕物质抛射是太阳大气中最剧烈的一种活动现象．当日冕物质抛射爆发时，大量的等离子体物质从接近太阳日面的低日冕被抛出，瞬时释放出巨大的能量．当一部分这些物质和能量传播到地球附近时，可以造成短波通讯中断、卫星工作失常等破坏性现象．文章作者认为，是缠绕的太阳磁场提供了足够的能量，使这些日冕物质可以克服恒星的重力以及周边磁场的束缚抛射出来；而磁螺度在日冕中的不断积累，不仅为日冕物质抛射提供了能量基础，而且使爆发在一定程度上成为一种日冕演化的必然。

英文摘要：

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 10^15-16 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.