The paper builds the influence factors of the greenness of products, analyze the influence relations between each pair of the factors, and employ interpretive structural modeling (ISM) to partition the hiberarchy of the influence factors after building the influence factors indexes system of the greenness of products by AHP method. Based on the hierarchy graph of the influence factors of greenness, which is got by ISM, we get the conclusions that popularization of the green knowledge, utilization ratio of advanced and/or high-efficiency equipments and kinds of materials are the primary influence factors of the greenness of products, and present some efficient advice to improve the greenness of products to direct the green manufacturing system to enlarge ecological industries to realize the basic goal of ecological civilization construction. And we disclose some scientific conclusions about the mechanism of the system of green manufacturing based on it at the same time. It is expected to provide some efficient advice for the decision-maker to develop green products.