Objective  To understand the etiological and epidemiological characteristic of infant diarrhoea in spring.Method  The clinical stool specimens taken from infant diarrhoea patients under 5  year  old were detected for pathogenic bacteria,rotavirus and other factors.Result  In 225 specimens,pathogenic bacteria is 18.7%,rotavirus is 8.4%,indigestional diarrhoea is 27.1%,indefinite reason diarrhoea is 45.8%.Conclusion  In infant diarrhoea of spring,except indigestion,pathogenic bacteria and rotavirus are still more important etiological factors.