Study on 103 records of children, under 5 years old with acute respiratory infection (ARI) admited to the Khoai Chau district health center of Hung Yen province, on the May 2001. The results: the rate of ARI classifications and diagnose following guidelines of WHO were 59.2% (low rate). Of those, the rate of children with pneumonia were classified following WHO guidelines to be 71%, no pneumonia to be 68.6%, severe pneumonia to be 20%. The rate of antibiotic treatment following WHO regimen were very low (6.8%). Overuse of antibiotics were very popular. Benzyl penicillin plus gentamicine were used not only for single pneumonia but also sore throat