In recent decades temperature elevation has been the focus of many studies on climate change, but few studies have examined the effects on gastropod communities. We performed a mesocosm experiment to simulate temperature elevation in shallow lakes of the middle and lower reaches of the Yangtze River in 2100 with two treatments, i.e., control and heating, to explore the effects of temperature elevation on morphology of Bellamya aeruginosa. Snail shell dimensions(area, perimeter, height and width) were easily quantifiable morphological traits by geometric morphometric methods, and were correlated with weight. Then analysis of covariance was applied to contrast the difference of regression equations between the two treatments and we recognized that the perimeter was statistically significant different when the temperature elevated. Meanwhile, higher temperature increased the individuals of recruitment in spring. The effects of temperature elevation on morphology of Bellamya aeruginosa were reflected in the following three aspects. The density of Bellamya aeruginosa was significantly increased in heating tanks, and induced small juvenile shell size after maturation as a result of more intense intraspecific competition. Elevated temperature led to different food quality in the diet of Bellamya aeruginosa, morphological variation was indirectly affected in the process of growth due to different qualities of food. When the water temperature got warm, the change of pH value generated limited calcium availability and constrained calcification within the shell simultaneously which influenced the shell formation and induced shell plasticity consequently.