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目的 掌握上海市宝山区历史有螺环境分布现状,为今后调整与制定螺情监测方案提供科学依据.方法 采用回顾性调查和现场调查方法,收集历史有螺环境相关信息,建立数据库、绘制分布图,分析各类环境情况.结果 宝山区历史有螺环境现有53个,面积1 635 530 m2,分布在3个镇,按改造程度分为Ⅰ、Ⅱ、Ⅲ、Ⅳ类,其构成比分别为73.58％、5.66％、16.98％和3.77％.Ⅰ类和Ⅱ类彻底改造环境42个,面积1 622 043 m2,分别占总数的79.25％和99.18％.结论 宝山区历史有螺环境变迁较大,现场调查信息应在不同时期作充实与更新,指导今后钉螺调查工作.“,”Objective To understand the distribution and characteristics of historical Oncomelania hupensis snail environ-ments in Baoshan District,Shanghai City,so as to provide the reference for adjusting and formulating the monitoring program of the snail situation in the future.Methods A retrospective survey and a field survey were conducted to collect the information of historical O.hupensis snail environments and set up the database.The distribution and characteristics of them were analyzed.Re-sults There were 53 historical O.hupensis snail environments which distributed in three towns,and the accumulative area was 1 635 530 m2in Baoshan District,Shanghai City.Class Ⅰ,Ⅱ,Ⅲ and Ⅳ accounted for 73.58％,5.66％,16.98％and 3.77％re-spectively.The complete transformation(Class Ⅰ and Class Ⅱ)was done in 42 places which covered the area of 1 622 043 m2,in which Class Ⅰ environments and Class Ⅱ environments accounted for 79.25％and 99.18％of the total,respectively.Conclu-sions There has been a great change in the historical O.hupensis snail environments in Baoshan District,Shanghai City.The information of the field investigation should be enriched and updated at different times to guide the investigation of O.hupensis snails in the future.