Abstract: Based on the results of field survey and sample testing,we select five groundwater chemical factors (Cl⁻, TDS, SO₄²⁻, A and SAR) as evaluation indices and uses the entropy weight–attribute recognition method to evaluate the degree of seawater intrusion in Xingcheng city, Liaoning province, China. Results show that 42% of the 50 sampling sites are mild seawater intrusion degree and 4% are serious degree. Mild intrusion areas are mainly distributed in the Heinikeng-Zhongxing-Miaohoutou village, the Hulitao-Wangjiahezi village ,the estuaries of the Yantai, Dongsha and Xingcheng Rivers, whereas serious intrusion areas are mainly distributed in the Zhoujiawopu-Qingtun-Haitao village. The consistency rate between the evaluation results of entropy weight–attribute recognition method and that of the chloride ion single index method is 66%, while the entropy weight–attribute recognition method can more accurately evaluate the distribution and degree of seawater intrusion. The obtained evaluation results could provide a scientific basis for preventing and controlling seawater intrusion and the sustainable utilization of groundwater resources in the study area.