Abstract: During the coal preparation plant design and production,a large amount of data of coal quality and technical parameters of coal preparation were collected through off-line or on-line method and stored in the computer,but due to these data are almost not further processed,so rarely play a role.These data actually contains most important information such as coal quality difference,appearance of anomalous events and fluctuation of products quality.This paper introduces a visual statistic analysis method—biplots,and its current research situation,the basic mathematic fundamentals and the performing tools,and on which basis,using the coal quality data and separation data verified the feasibility of biplots visualization analyzing method used in coal preparation data analyzing and displaying,that provides a novel method to mine the coal preparation data.