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With the continuous development of China's economy, outdoor swimming has become an indispensable sport for Chinese people thereupon. However, the pollution of the outdoor water environment is capable of directly affecting the physical health of outdoor swimming lovers. Given the above, this paper uses the Stochastic Impacts by Regression on Population, Affluence, and Technology (STIRPAT) model to analyze the environmental water pollution of lakes and study the influencing factors and degree of physical health of outdoor swimming crowds. Moreover, this paper also identifies the causes of water pollution in two respects, namely water pollution and human pollution and analyzes from the perspectives of water quality monitoring environment survey and questionnaire survey. The results show that the primary factors affecting water quality contain weather, swimming crowd density and environmental pollution around water areas, lake waters have direct and indirect effects on human health, and the incidence of eye inflammation, itchy skin, stuffy nose, sore throat, stomachache, nausea, earache, diarrhea, fever and vomiting are 36.4%, 30.3%, 29.5%, 26.5%, 21.2%, 20.1%, 20.1%, 17.0%, 14.8% and 12.9% respectively.