「一國兩制」下的香港特別行政區與「中華人民共和國」之間既不同於殖民地與 宗主國的關係，也不同於聯邦制下地方政府與聯邦政府的關係，更有異於中國傳統中央集權 單一制下地方與中央的關係，而是一種特殊且複雜的中央、地方關係。其不僅牽涉到政治、 經濟、法律等多重層面，尚且還有正式與非正式關係之區分。本文試圖從上述層面來審視兩 年多來中國大陸與香港之間的正式與非正式關係。本文認為，如何在「一國兩制」原則下妥 善處理好「中」港關係是一項前所未有的挑戰，而且攸關「一國兩制」的成敗和香港前途至 深。「中」港之間需要尋找出一種穩定與制度化的機制來處理兩者間的問題。

　　　　　The relationship between the People's Republic of China and the Hong Kong Special Administrative Region under "one country, two systems" not only differs from the relationship between a colony and its suzerain power, but also from that between a local government and the federal government in federal system. Furthermore, It differs from the relationship between a local government and the central government under a unitary system, as in traditional China with power concentrated in the center. It is in fact a special and complicated relationship between the center and the region. This complex relationship has its political, economic and legal aspects, as well as its formal and informal spheres. This article attempts to examine the formal and informal relationship between Mainland China and Hong Kong in the past two and a half years at various aspects and spheres. This article suggests that how to manage well the relationship between Mainland China and Hong Kong under "one country, two systems" is an unprecedented challenge, with a significant bearing on the success or failure of "one country, two systems" and the future of Hong Kong. Both Mainland China and Hong Kong need indeed to search for a stable and institutionalized mechanism by which to properly manage their relationship.