The condition of middle school students' mental health is the important topic for China's peoplediathesis and health promotion. Developing the mental health education in the progress of PhysicalEducation is the demand and tendency of modern education reform.The purposes of this study include: (a) to explore functions and effects of P.E. on middle schoolstudents' mental health. (b) to combine mental health' model with teaching methods in P.E. (c) toprovide the basis of psychometric qualities for students' physical fitness research.The methods of this study include: (a) Educational Experimentation: teachers taught physical and healtheducation to test groups in five months according to the teaching manual designed by author. (b)Investigation: target public was surveyed in the process of study. Qualitative and quantitative methodswere used in the study to evaluate acceptance and effectiveness of physical and health education.1453 students have involved in this study. They completed such things as KAP Questionnaire,MMHI-60, EFI, Volition Scale, SES, POMS, EFI and Social Adaptability Questionnaire.After intervened education, compared with the control group, the numbers of self-esteem,self-confidence, mood and social adaptability of the test group have changed which are 6.76,14.60,-5.07,8.80,8.65. The number of the students with non- mental health has increased by 12.72%, and thestudents who existed mental health have decreased 0.74%. Significant difference has existed amonggroups. Qualitative research also has indicated that physical and health education is an effective way toimprove students' mental health.The results of KAP survey and body test have indicated that the students' knowledge, belief and practicein the test group have increased 37.05%, 24.05%, 32.2%. The excellence percentage of body quality hasincreased 8.70% and failure percentage of body quality has decreased 8.85%. Meanwhile, the senses ofactive participation and energy stimulating have raised. It is good to middle students' growth.The return survey has showed that many indexes have dropped, the senior students' fall are moresignificant than junior students. Compare with the control group, the test group however still has keptfine body and mental condition and physical exercise habit. This situation has reflected the fluctuation ofstudents' mind and the complexity of students' mental health education.This study has established a developmental P.E. model integrated knowledge, belief and practice. Thisstudy has specifically discussed the theory basis, education target, education method and evaluationprogram of this education model. Furthermore, the methods to cultivate teachers and evaluatecurriculum have been studied as well.This dissertation has also raised some methodological issues for future research in Curriculumreformation of physical and health education and middle school students' mental health.