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The purposes of this research are 1) to analyse factors of attitudes towards obesity and health behaviours, and 2) to study the factors that influence the prediction of obesity of the personnel in The Air Technical Training School, Directorate of Education and Training, The Royal Thai Air Force. Factors to consider are gender, age, attitudes towards obesity and health behaviours. The sample was the personnel in The Air Technical Training School at all levels.Employees of 200 female and male workers selected by stratified random sampling were classified by agency. Data were collected using the attitudes towards obesity and health behaviours questionnaire developed by the researcher. The reliability value of the alpha coefficient of Cronbach is between 0.755-0.892. Statistics used for data analysis were mean, standard deviation, correlation coefficient. Component Analysis is used to create new variables. Multinomial Logistic Regression Analysis is used to predict the probability or chance of obesity among the personnel. Results showed that the variables that affect obesity are age, gender, attitudes towards obesity and health behaviours.This study revealed that older people are more likely to have obesity and males are more likely to be obese than females.The attitude towards obesity in food control, people who eat foods that contain a lot of starch and sugar or have little movement, will have a greater chance of obesity. For health behaviours, about high calorie foods, people who eat high calorie foods are more likely to get obesity. In health care, people who exercise regularly, eat brown rice and vegetables, have fun activity and always stay healthy, will have less chance of obesity. Factors affecting body weight, perspective on obesity, food time and relaxation do not have effect on predicting obesity.