Abstract: In this paper, five ecological areas of Anhui Province were selected to evaluate the ecological environment in 2011 and 2015 in all counties of Anhui Province based on relevant technical specifications of environmental protection departments. According to the situation of the five ecological areas, the paired sample t test was adopted to analyze the difference of each ecological area, so as to evaluate the changes of the ecological environment in each ecological area. Through the statistical analysis of the second-level index of each ecological area, the reasons for environment changing were obtained. The result could provide decision for environmental management.

Key words: ecological area, ecological environment evaluation, paired sample t test, difference analysis