Pignet of boys decreased from 42.59±2, 1 at age 12 to 31.51±2, 8 at age 15; female pupil decreased from 43.37 ± 5.1 to 32.48 at age 12 ± 0.3 Conclusion: Physical morphology and index of junior high school pupil aged 12 - 15 of ethnic H'Mông higher than 10 - 15 years ago.