Objectives The purpose of this study was to investigate the impact of 18 week exercise consultations for students on physical activity and fitness over after school. Methodology A two-group (intervention and control) pre-post design was used.42 students from 2 classes of 7th grade in a secondary school, were recruited and randomly assigned into as intervention group (N=24) and the control group(N=18). The intervention, which included sending emails, log on exercise consultations website and exercise consultations tips, consisted of 18 weekly exercise consultations of recommending more exercise and having an active living approach to life after school. Control group had similar conditions of study and PE class. Physical fitness parameters, physical activity record of three days，and effect of exercise consultations intervention using questionnaires were tested. General linear model with repeated measures, independent t-test, and Chi-square test examined to compare the differences. Results After 18 weeks’ exercise consultation, the results as follows. 1. Height, BMI showed main effect of time and interaction; weight, skin-fold thickness (tricep + calf), waist-hip ratio, grip strength, push-ups and flexibility showed main effect of time, but no interaction effect of time and grouping. 2. Physical activity had no main effects of time and interaction. 3. No significant difference in attitude of physical activity was found between the two groups. Conclusion The results showed that exercise consultation had some positive effects on student’s physical fitness and physical activity. Middle school should promote sports knowledge, arouse student’s enthusiasm to physical activity develop healthy life style and improve physical fitness.