Objective To investigate the infection of parasites in ICR mice in Xi'an.Methods\ The mice were sacrificed and parasitic infection was examined microscopically.Results\ Four genera of parasites were detected: Hymenolepis nana,Syphacia obvelata,Aspiculuris tetraptera and Giardia muris.Conclusion The intestinal parasitic infection is serious among ICR mice in Xi'an,and it is mainly mixed infection of several types of parasites.