Abstract: Objective To study the effect of dietary factors on bone mineral density in teenagers.Methods Totally 1 583 students of 13-19 years old were selected from 2 middle schools and 2 high schools in Tangshan city.Factors related to bone health and diet intakes were investigated and ultrasonic bone mineral density measurement was conducted among the students.The data were analyzed with SPSS 13.0 software.Results The average bone speed of sound(SOS)was 1 542.7±19.6 m/s for the boys and 1 539.8±20.2 m/s for the girls and increased with age,with a gender difference among the students aged 16-19 years.The SOS level was within the 95%reference range for the teenagers with the intakes of carbonated drinks of<300 ml/d,milk of 200-299 g/d,aquatic products of 50-99 g/d,bean products of 25-49 g/d or 99-200 g/d,vegetables of 150-299 g/d,calcium of 50%-99%adequate intake(AI)and phosphorus of 125%-149%AI.The SOS level was higher than the reference range for the students with the intakes of milk of 300-900 g/d,aquatic products of 100-350 g/d,bean products of 50-99 g/d,vegetables of 100-149 g/d,calcium of 100%-200%AI and phosphorus of 100%-124%AI.Conclusion The appropriate ditery patterns promoting teenagers's bone density are adequate intakes of milk,aquatic products,bean products,calcium,vegetables,and phosphorus and carbonated beverage intake should be minimized.