| The obesity had become a world public hygiene problem. The adult obesity rate was very high, and the treatment was very difficult. Child obesity became one of important and dangerous factors for adult obesity. Child obesity does obvious harm to child's growth,the immunity level, the tractarian function and the psychologically healthy and so on. So, it's important to study the related factors.This case take the Guangxi Zhuang nationality children as the Research Subjects, Methods The research included two parts. Through the cross section epidemiological investigation, understood recent years children's growth characteristic and the child simple obesity prevalence rate, the distribution characteristic and the secular variation tendency, discussed the necessity and the urgency on the child pure obesity control. Using the Body Mass Index reference norm for screening overweight and obesity in Chinese children and Adolescents that proposed by the Working Group on China (WGOC) in November, 2003. All the data collection and calculation were performed by using SPSS 13.0 package. Using the case-control study matched by 1:1 on the risk factors for obese. The case were selected from 266children obesity 7～15 years old. The controls were selected from other children of 266 normal weight matched by nationality, class, sex, the date of birth±2 month, the height±3 cm. The case and the controls matched by 1:1.Carry on the single factor analysis. Using X2-test for categorical data, using U- test for measurement data.The cross-sectional investigation which measured the weight and height of children were done in 1985,1995anfd 2006 in GuangXi. Results showed that the percentages of growth level had already greatly increased. The average increase of height of the 7～15 years old urban males from 1985 to 1995 was 3.52cm, rural males was 1.59cm, urban females was 2.67cm, rural females was1.50cm. From 1995 to 2006, The average increase of height of urban males was 2.41 cm, rural males was 2.33cm, urban females was 2.00 cm, rural females was2.82 cm. The average increase of weight of urban males from 1985 to 1995 was 2.53kg, rural males was 1.01kg, urban females was1.84kg, rural females was 0.41kg. From 1995 to 2006, The average increase of height of urban males was 3.83kg, rural males was3.50kg, urban females was 1.96kg, rural females was2.19kg. The average increase of BMI of urban males from 2000to 2006 was 0.53 kg/cm2, rural males was 0.47kg/cm2, urban females was0.52 kg/cm2, rural females was0.43kg/cm2. The Zhuang nationality child's bodily shape is in the fast growth stage of the long-term trend.The Zhuang nationality child's height enters to the suddenly increasing time is earlier than weight. There are obvious differences among the four groups. It displays that male students inters to the suddenly increasing time is later than female students. And rural students enter to the suddenly increasing time are later than urban students, but faster than urban students.From 1995 to 2000, the Zhuang nationality student's overweight rate increased steadily. In 5 years, 7 ~ 15 years old of the urban male overweigh rate increased 2.24%, the rural male overweight rate increased 0.46%, the urban female increased 3.04%, rural female increased 0.77%. The urban male obesity rate increased 2.12%, the rural male obesity rate descended 0.11%, the urban female increased 2.91%, rural female increased 1.22%.This findings: the urban male rates of overweight and obesity were 7.10%and3.35%, respectively. The rural male rates of overweight and obesity were 3.31% and 1.72%, respectively. The urban male rates of overweight and obesity were5.43% and 2.56% , respectively. The urban female rates of overweight and obesity were 3.05% and 1.46% , respectively.Zhuang nationality children's overweight and obesity rates were still in a lower level, overweight rate was two times of obese rate. It suggested that obesity rate will high. In 7~8 years old and 11~13 years old, the overweight and obesity rates were higher than other age .we should take it as the key age for preventing and controlling. Zhuang nationality children's overweight and obesity rates approached the level of Han Nationality in the south-west in 2000, and lower than Shenzhen , the economy developed south city .Child obesity is in fluenced by the genetic and enviromental factors.Mother or father obesity, both obesity and high birth weight were risk factors for child obesity. Carries on the continuous variable analysis according to BMI, the parents BMI higher, the child has the risk of obese bigger. The birth weight higher, the risk of obese bigger.The breast feeding rate in obese group was obvious less than the control. The breakfast irregular, took more cakes and wheaten food could cause the child to be obese. The obese child's appetite was good, liked to eat sweetmeat, fry food, fat, livers, eat and drink too much at one meal. Child obesity related to degree of preference for motion, density of activity, everyday exercise time, quality of sleep for children.The less enjoy physical activity and the longer everyday watch TV time, the bigger risk of developing obesity. The stronger density of activity,the longer everyday exercise time or, the smaller risk of developing obesity. The results did not show the correlation of children obesity with homework time, time of sleep.Child obesity related to child's study and mood.The data showed that where were lack statistic relrtionships between single child, character, income of family, educational level of mother, age and occupation of parent and childhood obesity.Knowing on Health, Obese and nutrition, The parents'raise the manner, the family economics situation and the family dietary habit are significant to children's health. Mother's influence is especially important to the child. Optimizing family diet environment is a key point to prevent and control the child obese.
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