A study has been performed on the arterial pressure (AP) in a population of healthy children aged 3-14. The study sample was formed by 837 subjects (394 boys and 443 girls) belonging to a middle, middle-low class level according to Graffar methods. Systolic and diastolic arterial pressure data (IV Korotkoff noise) in lie down position, sitting and standing, are obtained and related for both sexes with age, weight and height. Systolic and diastolic AP increased with weight and height in both sexes, specially in children above 6, and in all 3 positions. These values were respectively higher in standing position, being lowest in lie down position. We conclude with the interest of obtaining our own data given the already known influence of geographic, climatic as socioeconomic factors on arterial pressure values.