|（Department of Physical Education，Southern Medical University，Guangzhou 510515，China）
Abstract: By means of random sampling from stratified groups, the authors surveyed 4 483 college students in 9 uni-versities in Guangdong province, studied factors which affect injuries suffered by college students from extracurricular exercising. By applying the method of optimal scale regression analysis, the authors tested and analyzed factors which may affect injuries suffered by college student from extracurricular exercising, determined the degrees of importance of various factors, and revealed the following findings: there are totally 20 factors which affect injuries suffered by college students from extracurricular exercising; the two most important factors are whether warm-up is sufficient and whether movement violates functional requirements of the human body structure; gender, physical makings and exercising event adaptation, as well as exercising load and playground environmental conditions are 4 relatively important factors. By means of homogeneity analysis, the authors analyzed the homogeneous aggregation relations between various im-portant factors and degrees of injury, and revealed the following findings: there are differences between boy students and girl students in terms of cause for injury and degree of injury; there are differences between causes for different de-grees of injury; there are certain characteristics of aggregation between various causes.
Key words: school physical education；college student；athletic injury；optimal scale regression analysis；homogeneity analysis