Byintroducing a true example,the concept ofthediscrete random variable mathematical expectation is discussed,and ithelpthe students to understand the concept.By transformingatraditional example and solvinga problem using mathematics software,the comprehensive qualities of student are developed powerfully.Also,better teaching effectis achieved in theteaching practice.%教学实践中，根据真实案例引入离散型随机变量数学期望，通过对离散型数学期望概念的讨论，促进学生对数学期望内涵的理解。改造传统例题，利用数学软件解决期望问题，有力的培养学生的建模意识、数学软件应用能力等综合素质，取得了较好的教学效果。
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