As a space form of cultural existence, regional culture complex is made up of cultural landscape structure,cultural regional structure and cultural centre.Guangdong,Hong Kong and Macao,being originally an integrated one,have been divided into three political regions due to historical reasons.Western cultural policy hasn't been carried out completely by Portuguese and British governments in Hong Kong and Macao.Therefore,there remain common cultural features in Guangdong,Hong Kong and Macao,which are interrelated by innumerable ways.On this basis of analyzing the relationship of their terrain,history and clan and the function of their cultural blending,the paper,using the concept in cultural grade and the theory and methods of cultural space evolution,expounds the historical evolvement process and their respective features of Guangfu cultural core region of the Pearl River Delta,Hong Kong regional culture and Macao regional culture.Through their long period of mutual historical cultural function caused by differences of cultural potential energy,that is,cultural grade force in Guangdong,Hong Kong and Macao,including the intercommunion,collision and innovation of the following cultural factors as urban buildings,styles,language,literature arts,ideology,religion and value,etc.,forms a feature of co-existence,intergrowth,mutual supplement and mutual transformation of Chinese culture and Western culture,a blend of western and Chinese culture,and the space of Guangdong-Hong Kong-Macao forms an organic integration in about more than one hundred years.The three cultural centers of Guangdong,Hong Kong and Macao construct a regional culture complex which occupies an important place in the regional cultural system of Lingnan. It is also a favorable form of space organization in promoting regional culture development.More attention is supposed to be paid to the space form of cultural existence to promote the theoretical construction of cultural geography and the development of regional culture.The relationship of this complex has become closer in the trend of their economics and the space become an integral whole in Guangdong,Hong Kong and Macao.But due to historical causes and the enforcement of the policy of "One Country,Two Systems",further researches are needed on the differences and integration of inner layer cultural structure of the three regions with outward features in common.