【Abstract】 Objective To grasp the population distribution and seasonal fluctuation of rat?shape animals at Zhangjiagang port,  and to provide the science evidence for its prevention and control. Methods Night?trapping method was used in this study.  Results The rodent density was in a low level after taking integrated measure. In this survey, the average density of rat?shape animals from 2004 to 2007 was 0.10%. Mus musculus was the dominant specie, accounting for 48.42%. Rattus norvegicus and Crocidura lasiura accounted for 25.79% and 24.43%. Two peaks of density appeared in April and September, which were 0.35% and 0.31% in 2004, and two troughs appeared in December?January and June July, about under 0.05%. The density in mess and fencing was 0.13% while the density of warehouse was 0.03%. Conclusion M.musculus was the dominant specie at Zhangjiagang port, and the integrate control measures should be taken to reduce density of rat?shape animals to prevent the occurrence of infectious disease.