This study constructs a comprehensive evaluation system to assess the impact of aquatic invasive species from three dimensions: economic， ecological， and social impacts. First， a questionnaire was distributed using stratified sampling to collect expert assessments on the relative importance of influencing factors. Analytic hierarchy process （AHP） was applied to determine the weights. The results revealed that the economic impact （0.72） was considered more significant than ecological （0.17） and social impacts （0.11）. Top five influencing factors were direct economic losses （0.47）， niche occupation （0.11）， control costs （0.09）， eradication expenses （0.08） and public awareness （0.067）. Next， the impact of Pomacea canaliculata invasion in Shanghai was scored across districts. Areas with scores exceeding percentile 50 included Chongming （P₉₉）， Songjiang （P₆₈）， Jinshan （P₆₄）， Pudong （P₆₁）， and Qingpu （P₅₃）. In conclusion， a district-diversified and level-specific strategy is proposed for preventing Pomacea canaliculata invasion in Shanghai， guided by the principles of prioritizing economic impact， protecting ecologically sensitive areas， and incorporating public participation.