Study 1 investigated body dissatisfaction in 3937 Chinese young men and young women （mean age 18.90+0.85 years old）. The results indicated that more than half of the young women （55.2%） had body dissatisfaction while young men did not have dissatisfaction to their bodies in general. Underweight young men and women did not report body dissatisfaction. On the contrary，overweight and obesity young men and women expressed body dissatisfaction. There is a sex differentiation in normal weight young people that men are generally satisfied with their bodies，but women are not satisfied with their bodies. Nearly 2/3 normal weight young women expressed body dissatisfaction. In study 2，based on the revision of Ebody project by Stice et al. （2012），a Chinese version with the characteristics of Internet community interaction （Chinese version Ebody for short） was developed to perform the body dissatisfaction intervention. Ninety three young women with body dissatisfaction were involved in this intervention. The results showed that compared to educational brochure conditional and control condition，Ebody project intervention effectively reduced the thin ideal internalization and body dissatisfaction of young women.