Objective To understand the distribution and change trend of oncomelania snails in different epidemic types and different environmental types of schistosomiasis in Wuhu City from 2012 to 2021,and to provide reference for future snail monitoring. Methods According to the survey data of oncomelania snail in the schistosomiasis endemic area of Wuhu City from 2012 to 2021,the area of newly discovered,recurrent and infectious oncomelania snails,the density of oncomelania snails,the rate of occurrence of oncomelania snail frames and other indicators of oncomelania snail situation were analyzed. Results The area of oncomelania snails in Wuhu City decreased year by year from 2012 to 2015.The area of newly discovered oncomelania snails and recurrent oncomelania snails increased sharply in 2016,with 515.77 hm² and 266.67 hm²,respectively.During 2017 to 2021,there was a slow decreasing trend,in which the area of oncomelania snails in hill-type endemic areas was generally stable.There was little change in the area of oncomelania snails in the limnetic type endemic area after 2016.The density of live oncomelania snails fluctuated greatly every year,with a maximum of 1.62 snails/0.11 m² in 2015 and a minimum of 0.37 snails/0.11 m² in 2018.The occurrence rate of live oncomelania snail frame generally showed a downward trend (χ²=7 300.220,P＜0.001).In the past ten years,no infected oncomelania snails were found in the city.From 2012 to 2021,the number of oncomelania snails in the city showed a general downward trend,and the number of oncomelania snails in 2021 decreased by 14.00% compared with that in 2012. Conclusion The situation of oncomelania snails in Wuhu City has been stable in the past ten years,and the current prevention and control strategies and oncomelania snail control measures are effective.