How to assess the greenness of products from the viewpoint of LCA (Life Cycle Assessment) is one of the important issues in PLCA (Products Life Cycle Analysis). In this report, we present a non-uniform assessment method for greenness assessment of products based on DEA (Data Envelopment Analysis) model after analyzing the shortcomings of the existing comprehensive assessment methods for green products. This method not only assesses the greenness of given products with regard to technical reference product constructed by means of the information of products, but also illustrates how to improve the greenness of products quantitatively by utilizing the project theory on DEA efficient frontier of DMU (Decision Making Unit). Finally we take a numerical example concerning greenness assessment of refrigerators to show how to use the established method and prove its availability.