Shanghainese speak Shanghainese, also known as Shanghainese, Shanghainese, commonly known as Shanghainese, which is a dialect mainly distributed in the urban area of Shanghai and belongs to a small piece of Wu dialect in Taihu Lake. In a narrow sense, from the cultural and historical point of view, it mainly refers to Shanghai dialect, which is widely circulated and recognized as the mainstream dialect in Shanghai. Broadly speaking, from the administrative and geographical point of view, it should also include six suburban dialects, namely Pudong dialect, Songjiang dialect, Jiading dialect, Chongming dialect, Jinshan dialect and Wujiang dialect. Shanghai dialect retains more ancient Chinese factors: the old Shanghai dialect has entering tone and voiced sound; Shanghai dialect has mandatory rules and continuous tone sandhi; The old Shanghai dialect is divided into sharp sounds, and the sharp sounds are reserved; The vocabulary and grammar of Shanghai dialect are the inevitable result of historical accumulation and the continuation of civilization, with strong emotional color.