5,6th grade students of elementary schools in ChunCheon City were measured through the physical strength examination and the mental health. When the differnce of mental health to the physical health was verified through attentive degree on the average of the difference, the result was as follws 1. The difference in mental health to physical strength was found in the 5,6th grade of male and female students. The students who are physically healthy are usually in healthy mental condition. 2. Among the 6th grade students, the bigger attentive differences are found in the male students than the remale students\'s 3. Among the 5th grade students, the bigger attentive difference are found in the female students than the male students\'s 4. Both male and female students who are physically healthy, they are in healthy mental condition. the reason that the female students have higger attentive differences in mental health to physical strength is the female students are more sensitive to the mental health. 5. This results shows that because human system is the physho-Bio-system, the mental health and physical strength is related.