Malnutrition is the most important factor in children's death, as basic or associated cause. Mistake that is not good for health, there are great number of people in preschool and schoolar age who survived in chronic state of undernutrition and badnutrition.The nurse as a member of the health team would perform a fundamental role in the precocious diagnosis of under nutrition and malnutrition, using simple technics as weight, higher Shakir strip.The population sample is constituted of eighth six children that studied in a peripherical school of Ribeirão Preto, SP.In 80,17% of the children we have found undernutrition and malnutrition. The nurse's action having in view the schoolars and pre-schoolar children have been an incentive to the school manege-ment and to the government institutes aiming to get better the nutritional state and alimentary patterns of this studied population. Parallel carry out treatment "for pediculose, vaccinate, small curatives and children's guiding to Health's institution to continue treatment left premiousey