This article is all about the integration of environmental education to the middle school mathematics in China. To raise environmental awareness and improve environmental quality, environmental education is a must. Environment-related materials can be found in middle school algebra and geometry textbooks. In order to provide environmental education in middle school mathematics, teacher quality must be improved and environmental awareness must be enhanced. Here, the author presents some examples of teaching environmental education in mathematics class: (1) Plant Trees to Keep the Environment Clean; (2) Conserve Resources and Develop "Clean Energy"; (3) Utilize Land Resources Wisely; (4) Construct Water Conservation Projects to Save Water; and (5) Control Population Growth by Family Planning.