The paper analysed factors of acute diarrhea in children under five by Mantel-Haenszel stratification and Logistic regression. The total person-years of observation were 1332. The results showed that the combined risk factors which caused diarrhea were drinking the pond water and failure to wash hands before eating and so on. The combined intervention Measures, especially improvement of drinking water had effectively decreased the incidence rate of infantile acute diarrhea through the observation in the past two years.