The result shows:The vital capacity of body weight and the stair experiment index remarkably are connected with the university student's physical activity frequency and the intensity.

Overweight and obese primary school pupils of the lung capacity is higher than normal weight, while the vital capacity index was significantly lower than the normal weight students.

With the increasing of BMI, college students 'vital capacity, grip strength, back strength gradually increased, however, the associated physical fitness mass indexs decreased.