"Old Zhengxing Restaurant" was founded in the first year of the Tongzhi reign of the Qing Dynasty (1862), is the earliest restaurant in Shanghai since the opening of the port of Shanghai to operate Shanghai Shanghainese cuisine, which has been passed down for 158 years, and is the originator of Shanghai Shanghainese cuisine.

"Old Zhengxing" was located in Shanghai Jiujiang Road, Lane 350, the former mainland shopping mall (formerly known as the Buddha store), its founder is the brotherhood of Zhu Zhengben and Cai Renxing, take the two names of a "positive" and "Xing" for the name of the store, called "Zhengxing Hall". Later, because of the good business, some restaurants would hang the signboard of "Zhengxing" under false name, so Zhu and Cai added the word "Lao" before the word "Zhengxing". From then on, "Zhengxing Hall" became "Old Zhengxing Hall".

Lao Zhengxing's earliest dishes were mainly Shanghai-style seafood and river food, such as salted pork and pork leaves, grass carp and tofu, fried fish noodles, intestines and noodles in soup, and so on, and in the course of more than 150 years of evolution, some of the dishes disappeared from the menu, but the old Zhengxing created a lot of new dishes and won awards frequently.

On the menu of Lao Zhengxing, the award-winning dishes are listed under the various honors and awards that have been won.