Since 1970s,the gap of policy-implementation has become increasingly prominent,and scholars of public policy in the West have been paying more and more attention to it,a variety of theories and viewpoints emerged as a result.As a contrast, although China encournters much more difficulties in the area of policy implementation,not much has been done.Therefore,by summarizing the theories and profiles of policy-implementation in the West,the horizons of domestic researchers could be broadened,and the quality o...