摘要：本文主要探讨了概率论中的四种常用的离散型随机变量的分布及三种常用的连续型随机变量的分布，即“0-1分布”、超几何分布、二项分布、泊松分布、均匀分布、指数分布、正态分布的来源及其在实际中的应用，并探讨了二项分布、超几何分布、泊松分布、几何分布、正态分布的关系，有助于增进我们对这部分内容的理解与掌握。

关键词：随机变量；离散型分布；连续型分布；相互联系

Abstract:This paper mainly discusses the orgins and applications of the seven common distributions in probability,including “0-1” distribution,binomial distribution,hypergeometric distribution,Poisson distribution,uniform distribution,exponential distribution,normal distribution.Then,it discusses the link between binomial distribution,hypergeometric distribution,Poisson distribution,geometric distribution and normal distribution.Our discussion can help us in understanding and mastering the content of this part.

Key words:random variable; discrete distribution; continuous distribution; link