Previous studies on the Nanhaishen Temple 南海神廟 (Temple of the South Sea God) in Guangzhou in the Song dynasty focus mainly on its state sacrificial ritual and local temple fairs, without fully discussing the differences of the sacrificial ritual between the Southern and Northern Song dynasties or the changes of the sacrificial ritual in Lingnan after the Song dynasty. This paper aims to illuminate the following five points. First, after the reunification of the Northern Song dynasty, the sacrificial ritual to the South Sea God in Guangzhou was advanced. Second, when the South Sea God and his temple were conferred with the holy titles for the fourth time, the god's role to bless local stability was further manifested, which means the imperial power gradually permeated into the Lingnan culture. Third, the blessing of the South Sea God was more prominent than ever before because of its geographical location in the southeast of the state during the Southern Song dynasty, and thus the Nanhaishen Temple Fair was the largest of its kind in Lingnan. Fourth, the stele inscription of Liuhou Zhi Ji 六侯之記 (Records of the Six Lords) shows that local people attempted to incorporate their folk beliefs into the canonized sacrifice to the South Sea God, and thus many religious spots were built in other places in Lingnan as detached palaces (ligong 離宮) of the god who was generally endorsed by the local officialdom. Fifth, the sacrifice to the South Sea God in Guangzhou in the Song dynasty had a far-reaching influence, as the god was worshipped by the later generations in the temples which also accommodated the worship of Buddhism and Daoism. In summary, the lengthy process for the South Sea God to evolve from a national god to a local patron is the result of the country's long-term implementation of the ritual system as far as the ritual culture is concerned. [ABSTRACT FROM AUTHOR]