Stunting in children is a public health problem and is one of the indicators to appreciate of human resources. Objectives: defining the prevalence of stunting and some associated factors of children 11-14 year old at secondary schools in Can Tho. Method: cross-sectional study. Results: 1038 students were studied: the prevalence of stunting was 14.6 percent, risk factors associated with high stunting were: living in rural areas, poor or average economy, parent's education at secondary school or less, parents occupation were farmer, eating less than 3 meals, not breakfast, not doing exercise, smoke contact 5 days/week or more than. Conclution: Prevalence of stunting is 14.6 percent. Risk factors associated with high stunting are living in rural areas, poor economy, parents of pupils are at secondary school or less and farmer, eating less than 3 meals, not breakfast, not doing exercise. smoke contact 5 days/week or more than.