Objective To investigate the late identification and its influencing factors of newly reported HIV/AIDS cases in Shangcheng District,Hangzhou City,so as to provide insights into the development of strategies for early detection and identification of HIV/AIDS cases.Methods Basic information,identification routes and CD4+T lymphocyte counts among newly reported HIV/AIDS cases in Shangcheng District from 2013 to 2022 were collected through the Chinese Disease Prevention and Control Information System.The proportion of late identification of newly reported HIV/AIDS cas-es was analyzed,and factors affecting late identification was analyzed by a multivariable logistic regression model.Re-sults Totally 1 052 HIV/AIDS cases were newly reported in Shangcheng District from 2013 to 2022,including 1 011 males(96.10%),and had a mean age of(32.90±12.39)years.There were 333 cases with late identification,accounting for 31.65%.The proportions of late identification have no significant changing trend from 2013 to 2022(P>0.05).Multi-variable logistic regression analysis showed that HIV/AIDS cases aged 25 years and older(25 to 49 years,OR=1.894,95%CI:1.350-2.658;50 years and older,OR=3.010,95%CI:1.838-4.928)had a higher risk of late identification,while HIV/AIDS cases with college degree and above(OR=0.655,95%CI:0.459-0.936)and identified by voluntary counseling and testing(OR=0.542,95%CI:0.380-0.772)had a lower risk of late identification.Conclusions The proportion of late identification of newly reported HIV/AIDS cases in Shangcheng District from 2013 to 2022 was 31.65%.Age,edu-cational level and identification route were important factors affecting late identification of HIV/AIDS cases in Shangcheng District.