Abstract: Objective To understand the children body composition characteristics of Songjiang District of Shanghai, body composition standards developed for 6-8 yeras old children to provide data support, and for the research and control children's nutrition and health level to provide a certain basis.Methods By random cluster sampling, 903 children were selected for body composition detection, including height, weight, body fat, protein, bone mass and so on.Statistical analysis was performed using SPSS20.0.Results The overweight rate for these children was 3.9%, the obesity rate was 1.9%.The height of children aged 6-8 in Song Jiang district increased by about 5 cm each year, and the weight increased by about 3 kg each year, and the bone mass and protein level increased year by year (P<0.05).There was no difference between fat weight, bone mass and protein content in boys and girls of the same age (P>0.05).In the age of 8 years, the muscles of the body content showed significant difference (P<0.01) except for the trunk area.The fat-free mass, bone mass and protein content of the same age had no significant difference between the same age (P>0.05).The boy's FM% increase with age, and the FM% of girls increased with age between 6 to 7 (P<0.01), whereas between 7-8 basic remains unchanged, at the age of 7, girls FM% was higher than boys (P<0.05), while at the age of eight, boys body fat rate was higher than girls (P < 0.05).Conclusion In the age of 6-7, children's body composition increases with age, but the gender difference is small, and the gender difference in body composition changes is obvious at the age of 8 years.It suggests that we need to pay attention to the age difference for while research and formulate policies for 6-8 years old children.