Title: The research for nutrition and appropriate weight gain of pregnant women ABSTRACT Objectives: Investigate and understand the diet of pregnant women in Xi'an food consumption and nutrient intake, weight gain in pregnant women to collect data in order to provide reasonable dietary advice, weight gain of pregnant women in Xi'an appropriate to advise health care during pregnancy. Methods: 2010 In April 2010 in Xi'an in August to collect the 242 pregnant women conducted a longitudinal study to observe their food consumption during pregnancy diet, nutrient intake; pregnancy weight change and the final pregnancy outcome. Study using 24-hour dietary recall method investigated the situation of different diets of pregnant women, pregnant women were measured pre-pregnancy weight and pregnancy weight, pregnancy outcome was recorded cases, the form of a questionnaire to obtain their socio-economic information. Analysis of food consumption, nutrient intake; pregnancy weight gain; different ages, different pre-pregnancy BMI, birth weight in pregnant women during pregnancy weight gain in different conditions. Results: ① second trimester pregnant women in early and did not meet the recommended intake of energy intake (RNI), energy intake during early pregnancy 1652kcal, the RNI of 78.7%, medium 1914kcal, the RNI of 83.2%, late 2365 kcal, for the RNI 102.8%. Protein intake in early pregnancy to 80.2% RNI-, medium-83.2%, 96.8% late. The intake of vitamin A, 75.7% of RNI, respectively, 78.4%, 82.4%; vitamin Bl to RNI of 49.3%, 54.67%, 70.7%; RNI of vitamin B2 to 43.5%, 55.9%, 68.8% ; vitamin C intake volume to varying degrees over the RNI. Early, middle and late calcium intake during pregnancy to achieve adequate intake only (AI) 56%, 58.6%, 54.2%; iron intake of Al, 122.2%, respectively, 107.6%, 63.9%. ② age of pregnant women in this study was 28.1 ± 3.9 years old, pre-pregnancy weight was 58.14 ± 8.91kg, pre-pregnancy BMI was 22.56 ± 3.06kg / m², the end of weight gain during pregnancy 15.94 ± 4.67kg, neonatal birth weight in pregnant women in 2500-4000g weight gain during pregnancy is 15.80 ± 4.67kg. Low pre-pregnancy BMI, weight gain in normal and overweight than obese; pregnant women of normal birth weight, pre-pregnancy BM workers is too low, normal and overweight weight gain during pregnancy were higher than obese. Conclusion: Xi'an pregnant women dietary variety and nutrient intake level but uneven, proposed to strengthen the health education of pregnant women, increased animal food, milk and dairy intake. The survey also weight gain during pregnancy is higher than the recommended value 12.5kg. Pregnant women after 28 weeks pregnant weight gain should be strengthened to monitor the situation. KEY WORDS: pregnant women;food;nutrient;pregnancy;weight gain TYPE OF THESIS: Research Report