The origins of the suburban native of shanghai are varied. With the methods of correlation analysis and principal analysis, we random sampled the surnames of 13 villages and towns located in the districts of Shanghai, and found that Jading, Pudong, Nanhui and the east part of Fengxian make up the group of northeast part, while Jinshan, Songjiang, Qingpu and Chongming make up a completely different one from the other. The surnames of Nanxiang's origin are complex, while Maqiao and Jinhui's are of special kind. The surnames recorded in pedigree have apparent correlation with the modern ones. Moreover, the surnames of northeast part are mainly derived from the areas north to Yangtze River, but those of southwest part come from the areas south to Yangtze River. This explains that the origins of the two districts' throng may be different. The residents of the northeast part, which formed land comparatively recent, probably came from north areas after Tang and Song periods, while those of southeast part came from other northern areas. The residents of shell bar districts such as Maqiao and Jinhui have inherited relation with the culture of remote antiquities of Maqia. The contributing factors of surname are diversified. By researching into the scope of intermarriage of 20th century in Jinhui, we found that before 70's, the intermarriage radius was fixed in 5 kilometers because of match maker custom; in the 70's & 80's, unrestrained love reduced the intermarriage radius into same village about 3 kilometers; after in 90's, the intermarry radius expand to every province because of the rapid social and economic development. The intermarriage scope and consanguinity natural diffuseness can stand for the situations in shanghai and in large parts of south China. The assimilation of adjacent villages under matchmaker custom takes over 2000 years, while takes over 7000 years under unrestrained love. We can see that the impact of the natural diffuseness is rather weak, and the mixed living of emigrants is the main factor. The history of every colony's adjacent living is far shorter than that of assimilation. So there is almost no mixed race in this period. The most parts of south China's situations should be similar. The broken of traditional intermarry suggests us that the auto-disappear speed of abundant genetic resource is high. It is now the most pressure time to gather and research our genetic resource.