Abstract. It is extremely important to evaluate the efficiency of equipment. There are some papers studying the method of evaluating efficiency, while they don't consider environmental impact. In this article a method for evaluating efficiency of electronic equipment with environmental impact is put forward, based on environmental impact model and the method of AHP, which is defined as E3IM. Every equipment has its own capacity index, representing the capacity that equipment can meet. First, we introduce environmental factors to each capacity index separately. Then we give formalized definition of environment and set environmental impact model based on the utility function of Logistic regression model. With environmental impact model, we can get the value of environmental impact. Finally we evaluate the efficiency of equipment with method of AHP. What is more, we apply C3IM to evaluate some equipment and compare the result with the result of ignoring environmental impact. By the research we can conclude that E3IM can be used in the evaluation of equipment and can make evaluation result more accurate and credible.