There are many important probability models in probability statistics, such as statistical probability, righteous probability, classical probability, conditional probability, geometric probability, etc. Different probabilistic models present many important problems. Through practical cases, a series of typical problems are studied in practical application. Solving practical problems can enrich students 'professional knowledge of mathematics, and cultivate a person's mathematical practice of logical reasoning and the application ability of complex problems. Therefore, you should study the mathematical thinking methods of the important problems in these models, and you can apply them to other disciplines to use mathematical ideas to solve practical problems