In order to better develop college sports in Guangxi Science & Technology Normal University, the mode of “integration of class and outside” is used for teaching and training to improve students’ physical quality. The method of literature, expert interview, questionnaire survey, mathematical statistics and so on. The paper analyzes the operation mechanism of the physical education teaching mode in college of Guangxi Science & Technology Normal University, and finds that the teaching mode of “integration of inside and outside class” takes health first, quality education, lifelong sports as the guiding ideology, and the extracurricular sports are included in the usual scores of skills, including the participation of fun running activities and various competitions. There are also some problems in the practice process of this teaching mode, including: insufficient continuation of in-class physical education to extracurricular “perfect sports,” imperfect internal and external evaluation system of public physical education, and inapproriate supervision of extracurricular activities. Therefore, in view of the above problems, this study proposes to establish an incentive mechanism for participating in extracurricular sports activities, enrich the content and methods of internal and external evaluation of public physical education, and establish a sound supervision system for extracurricular activities, in order to help the development of the school’s physical education “integration inside and outside class” teaching.