Objectives To understand malnutrition status and changing trend of youth and child,and to provide reference of develop related nutrition improvement strategy in Guangxi. Methods Survey data of 2 913 children and adolescents aged 2~18 years were collected of the "China Health and Nutrition Survey" from 1989 to 2011.Reference standard of Z score method of CDC (2002) was used to evaluate the children's malnutrition status. Results The rates of children and adolescence's stunted growth,low body weight and wasting were gradual decrease,from 38.1%,31.0%,16.1% in 1989,to 8.0%,21.5%,9.0% in 2011 respectively.In 23 years,the downward trend of wasting rate of boys,rural children and 2~6 years old group was not statistically significant (χ²=1.26,0.02,3.59,P all>0.05). Conclusion The malnutrition have been greatly improved among children and adolescents in Guangxi,but the low body weight rate is still relatively high level,the malnutrition should further improved among rural children and preschoolers.