Sichuan Du Zhihua Agriculture Co., Ltd. (formerly Sichuan Santai Zhihua Food Co., Ltd.) was founded in 2007, formerly the Zhongtai Township Enterprise Egg Products Factory founded in 1983. It is a professional enterprise focusing on the production of lead-free golden Century egg. The company currently has 26 employees and 3 technical personnel of various types. The company has a 7000 square meter standardized golden Century egg production plant, located in Hongqi Street, Zhongtai Town, Santai County, Sichuan Province. The total assets of the enterprise are more than 30 million yuan, the annual production of lead-free craft gold Century egg products is more than 10 million pieces, and the sales revenue is more than 20 million yuan. It was rated as "Leading Enterprise of Agricultural Industrialization in Mianyang City", "Small and Medium sized Technological Enterprise in Mianyang City", "Small and Medium sized Growing Enterprise in Sichuan Province", and was awarded the "Record Certificate of Export Century egg Production Enterprise" by the Import and Export Inspection and Quarantine Bureau. "Du's Century egg pickling skill" was rated as the intangible cultural heritage of Sichuan Province. The company has a series of products, such as Du Zhihua tasting gold Century egg, inheriting gold Century egg, Du Zhihua hand made salt eggs, Du Zhihua quail Century egg. The products are exported to domestic high-end markets such as Ito Yokado and Holly Way.

Du's salting technique of Century egg is the traditional lead-free Century egg making technique of Sichuan Du Zhihua Agricultural Co., Ltd. In 2023, it was rated as the intangible cultural heritage of Sichuan Province. This technique obtained one invention patent, "a production method of Songhua Century egg, patent number: ZL201110055593.8", and nine practical patents.

Food and beverage,