利用因式化方法和升降算符的性质,得到氢原子的跃迁矩阵元的解析式,从而得到氢原子能级平均寿命的解析计算式,具体计算了氢原子n=2-30的能级平均寿命,并与文献中列出的数据相比较,结果符合得很好.%By virtue of factorization method and properties of ladder operators, a practical formula for transition matrix elements of hydrogen atom was derived. On the basis of this formula, an analytic calculation method for energe level lifetime of hydrogen atom was obtained. In this paper, lifetimes ( n = 2 - 30) of hydrogen atom were calculated concretely. And the numerical results are in accordance with that listed in the literature.
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