At the beginning of the 21st century, discoveries in Songjiang Guangfulin Cultural Relics made great contribution to archaeology. Firstly, it clearly divided the primitive society into types like Songze Cultural, Liangzhu Cultural and Guangfulin Cultural, which was considered to be the cultural relics of New Stone Era in Taihu area; secondly, immigrants from the Yellow River were conformed to be the first group of immigrants coming Shanghai; thirdly, there were towns in Shanghai dating back to as far as Zhou Dynasty; fourthly, two unique types of houses in primitive society were found: stilt house and ground house.