【Objective】 To study the growth and development status of only-child aged 6~14 years old,and to provide scientific advice and direction for the health care of children and adolescents. 【Method】 4 167 only-child aged 6~14 years old in Bao'an district were got medical examination about their height,weight,ENT,internal medicine,surgery,blood-test,B ultrasonic of abdomen,etc. 【Results】 1)The tendency of growth and development of only-child corresponded with the average development regularity,the height and weight increased with age,two cross phenomena were observed in the development curve of height;2)The level of the growth and development was above the whole national average of 2005,while the nutritional status was far from ideal,the rate of obesity was 18.43%;3)The rate of poor sight,dental caries were high among the common diseases,the detection rate of kidney stone with B-ultrasonography was 4.6%.It's worthy mentioned. 【Conclusion】 The growth and development status of only-child is better than before,but the imbalance is very serious,and some new health problems appeare.