We adopted various teaching patterns and introduced the internationally accepted 3R principle(refinement,reduction and replacement) into the teaching of Laboratory Animal Science course,which has obtained satisfactory results.

According to the 3R principle in recycling economy,this article discussed the effective use of aged asphalt pavement,resource recov- ery and social,environmental and economical assessment,confirmed that recycle technology of aged asphalt pavement meet the necessity of re- cycling economy.

The system model of manufacturing for cycling economy, and particular implementation of3R principle of cycling economy are explored.

However,there are many defects in the process of developing recycle economy: failing to conform to the 3R principles;heavy secondary pollution;ambiguous producer responsibility;the concept of consumption remaining unchanged.

On the basis of analyzing the reasons in detail,according to Circular Economy s Principle of 3R(Reducing,Reusing,Recycling),this paper proposes some relevant countermeasures,including changing idea and consciousness,enhancing technological innovation,improving system reformation and promoting management.