当前世界格局发生着巨大的变化,各国各领域都飞速发展着,但是能源问题尤为突出,因此核能源进入了人们的视野,在见证了二战中原子弹的威力后,人们都意识到核能可以带给人类福音或者也可能会带来灾难,三里岛核泄露事故成为了核电发展的拐点,到底核能源的发展该何去何从,我们需要认真客观的总结过去,在历史中吸取经验与教训,本文以三里岛核事故为背景从事故发生的原因、过程进行分析,从而客观科学地总结经验教训以及核电发展带给我们的启示.“,”Nowadays,the world pattern is undergoing tremendous changes, and various fields in each country are in a rapid development, but accompanying the par-ticular energy problems. Therefore nuclear energy has entered public's sight, and people have also realized what kind of benefits or disasters nuclear energy could bring. The accident of the nuclear leakage in Three Mile Island has become the key point of nuclear power development. We need to analyze the past seriously and objectively to absorb experience from history, knowing the direction of the nuclear energy. This article analyzes the reason and process of the accident based on its background, to sum-marize the lesson and the enlightenment from nuclear power development objectively and scientifically.