Probability theory and mathematical statistics is mathematics research regularity of random phenomena in which the probability theory is the study of random phenomena inherent logic of theoretical system and the general laws of mathematical statistics the main mathematical basis of statistics, study how to effectively collect, collate and analysis with random data to reveal the randomness of the data behind the law, and then examined the question of inferences or prediction until provide evidence and recommendations for the adoption of certain decisions and actions. Both complement each other, one for Mathematical Statistics Probability theory provides theoretical support, on the other hand mathematical statistics, probability theory applied to specific issues of a number of empirical support, so as to jointly reveal specific problems random law the actual decision-making.