Objective: To determine physical development and strength level among 12-17 year old adolescent in Songino Khairkhan district and to compare it with other results. Methods: “Test method for determination of physical development and strength level” was used as a rule for the study in Songino khairkhan district among 12-17 year old people. Five qualities in human body (strength, speed, flexibility, tolerance and coordination of movement) were assessed for 9754 adolescents in Songino Khairkhan district. Results: Five qualities of human body for participants were assessed in this study, those 8.9% of boys, 6.5% of girls were in bad level (p < 0.01). When level of five qualities in the human body of participants in this district was compared with regions and other districts’ study results, physical development and strength level of population of 12-17 year old adolescent in Songino khairkhan district were showed better result than western regions, Khangai regions and Khan-uul district and same with eastern regions and lower than Bayanzurkh district and central region. Conclusion: Physical development and strength level in Songino Khairkhan district among 12-17 year old population were different between boys and girls in terms of tolerance and strength. However, there were slight differences in terms of coordination of movement, flexibility and speed. Physical development of 12-17 year old population has showed no distinction whether in urban or in rural area and the most were in under mean level (C to F).