In order to promote the sustainable development of outdoor sports, it is necessary to actively advocate the development of outdoor sports that is compatible with ecological civilization. This paper summarizes the influencing factors of outdoor sports on the natural environment. The author focuses on the evaluation methods of UEE (Urban ecological environment), constructs the evaluation index system and MIEP (Maximum Information Entrepreneurial Principle) evaluation model, and makes case studies in different cities. To a certain extent, this model reflects the evolutionary dynamic mechanism and spatial-temporal evolution characteristics of UEE, which not only has great advantages in evaluation, but also has potential in the prediction, regulation and management of UEE development and change state. Good ecological environment of alkali city can improve the physical and mental health of outdoor sports personnel.