Hong Kong's return to the motherland, its future was generally well received worldwide attention. Hong Kong's prosperity today is the product of the combination of its internal factors and external factors. Which external factors, the role played by the Mainland is unmatched. Mainland has been able to have such status, the key lies in the Mainland and Hong Kong has developed into an interdependent relationship, a correct understanding of the interdependent relationship, and its resulting impact (adverse and beneficial), take appropriate future measures, continue to maintain relations of cooperation between Hong Kong and the Mainland, to promote the common prosperity of the Mainland and Hong Kong, will undoubtedly have an important significance.