【正文】 t. Circular economy development pattern is from one of resources of renewable resources, one of green products posed by the material energy of the closedloop feedback loop process, this closed loop system, can maintain economic production of low, highquality, lowwaste, which will be economic activity of natural resources and environmental impacts to minimize damage. Interpretation of the circular economy mode 3R principle 3R principle is the basic manifestation of the economic cycle, and its specific contents are as follows: Reduction principle is the first principle of circular economy, that is the source of control method, which requires the source of economic activity the design stage, pay attention to the use of resourcessaving and pollution reduction requirements with fewer resources to achieve the established purpose of the production or consumption In the production areas, usually the energysaving production processes, materials and conservation of resources, the products of small size and lightweight, and easy and simple packaging requirements in order to achieve the purpose of reducing waste emissions。 Fourth, the product is intended to be simple and clear language。 Third, improve the repair of products can extend the life of the product. Product design is removable at the design stage, so that parts of the Products has a good performance of the demolition. Conducive to the reuse of ponents or recycled materials to save not only protect the environment and Materials . The demolition of the design requirements, Product First, connect the various parts and ponents, as far as possible the use of detachable connection, such as threaded connections, unified type fasteners, reducing the number of fasteners, try not to use welding, riveting, bonding and other nonremovable the connection。 Third,using standard, modular product structure. The impact of design material 3R principle in guidance and norms, product design, material selection should be taken into consideration: First of all, minimize the use of materials. Try using high quality materials to enhance the service life of products。 marked parts Products material position for the materials to facilitate recyclingand so on. 4 From 3R to 4R In the recycling economy mode, the product life cycle from the previous endoflife for the end product, after the extension to the endoflife recycling. It should be noted that starting from the waste products for the consideration of a second use for them, so that the product design is no longer a product before, but the other products. Therefore, the design process we will call it reengineering (Redesign) The concept of reengineering The socalled reengineering, that is, through the product ponents as well as their overall utilization of the redesign method to save resources. Given the United Kingdom Environmental Design Alliance is defined as: Materials by Product, the structure of a meaningful way to reuse, in order to save resources for the purpose of the premise, to extend the product life cycle, and tap the potential ecological value of the design method. In short, the product reengineering refers to the product life cycle after the reuse design. Whether they are reengineering the design of a new trend, or the design of a selfactivity changes, which are related to the sustainable development strategy in line belong to the scope of green design. If it is said that green design is usually considered the entire product lifecycle environmental impact, and redesign considerations are at the end of product lifeweeks to reduce the environmental impact of problem, it is the 3R principle in the extension of the field of industrial design. Therefore, the reengineering in conjunction with the 3R principle, as a mode of circular economy 4R principles of industrial design. The form of reengineering Product reengineering is aimed at new products to effectively use the original parts and ponents products and materials. Product reengineering have a variety of forms, for the same product reengineering can have a variety of forms, can be divided into assimilation and alienation of the reengineering reengineering. Assimilation refers to redesign is a before and after reengineering products, have been recycling their own reengineering of the parts not changed before and after. For example, before the redesign car audio, reengineering the home was converted into sound. Alienation refers to the reengineering redesign before and after are different products, reuse of ponents was necessary in order to be used transformation. For example, reengineering before the cell phone ponents, into a walkietalkie after the reengineering of an important part