Probability theory involves a wide range of fields in life. This paper analyzes several probability problems in life: the relationship between the probability of events and the order of experiments, the probability in disease diagnosis and the probability in gambling, and explains the reasons reasonably, which also provides enlightenment for our daily life. Author: Hongchun Wang Author: School of Mathematics and Computer Science, Chongqing Normal University, 400047 Title: World Economic Yearbook of Chinese Businessmen, Higher Education Research English Title: World Economic Yearbook of Chinese Businessmen, Nine-year Volume (Issue): 2009 (6) ClassificationNo.: TL364+.5 Keywords: Standard ClassificationNo. of Probabilistic Gambling Fair Machine: O2 1 F23 Machine Standard Keywords Application of Bayesian Conditional Probability Model in Teng Mathematical Diagnosis [Journal Paper]-Journal of Mathematical Medicine 2005(03) Guo Jiali Xu Yongyong. Mid-term analysis method of conditional probability in clinical experiments [journal papers]-China Health Statistics 200 1(05) Probability Theory of Fudan University 1986 The relationship between the size of Zhang Qi's gambling books and winning or losing 2000(03) The fairness of gambling books 1999(03) The application of Rebecca probability statistics in practical problems [