When an enterprise produces school uniforms, it often takes the clothing specification and size based on the students’ height and weight as the basic information. This kind of method relys on the experience, it is difficult to meet the developing requirement of clothing digitization. This paper analyzes characteristics of the male university students’ bodies in Liaoning area, based on the survey of 270 university students’ bodies, in which 15 body measures were taken. The body characteristics and the data distribution of these people were obtained according to the national clothing size standard. Through the regression analysis of the body height to 4 lengths, such as the cervical vertebral height, the sleeve length and so on, and the chest girth to 8 girths, the key measures are obtained and the regression equation is established. The multivariate analysis based on the height and the weight proves that the waist girth is mostly influenced. Through the regression equation of the waist girth to the height and the body weight, the influence of body weight change on the waist girth with a certain height can be obtained, and the chest girth and the hip girth as well. It’s helpful to determine the size specification of the school uniform. This research also provides a reference to digitizing of the clothing design and manufacture.