全概率公式和贝叶斯公式是概率论教学的一个重难点，一般的授课方法是直接给出公式内容，对照例题套用公式，学生接受起来比较困难，理解不了公式的内涵。笔者结合课堂实践采取一种新的授课方式：结合实例给出应用背景、引导学生理解公式内涵、妙用概率树图法求解公式，以此方法简化了思考过程且达到了学以致用的目的，收到了很好的教学效果。%The total probability formula and the bayes formula are the key and difficult points in probability teaching. The general teaching method is that the contents of the formulas are given directly, then used mechanically, It is difficult for students to accept and understand the connotation of the formulas. A new teaching method is adopted by the author combining classroom practice, giving the application background in combination with examples,leading the students to understand the connotation of the formulas, using the probability tree graph method wonderfully to solve the formula, so that the method can simplify the thinking process and make us study for the purpose of application. and has achieved a very good teaching result.
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