The "Zhengzhang" brand was born in 1925 in old Shanghai and was founded by Mr. Wu Jinzhang, a businessman in Shanghai. Shanghai Zhengzhang Dyeing Co., Ltd. has developed since its development, and has established an important position in the Shanghai washing and dyeing industry. Its business is mainly divided into two major parts: washing and dyeing services and daily detergent production.

The washing and dyeing service is a special main business formed by the company's 80 years of experience. It is famous for its excellent service and superb technology. It includes washing, ironing, dyeing, weaving, and leather clothing polishing. The slogan "washing and conditioning comes from the Zhengzhang" has been deeply rooted in people's hearts. The company currently has 7 senior technicians, 10 technicians, and nearly 50 middle and senior workers in the washing and dyeing industry. Since 1995, the company has implemented a chain operation model of washing and dyeing services across the country. After continuous optimization and adjustment of outlets, there are nearly 180 Zhengzhang laundry service chain outlets in Shanghai. Currently, the company has more than 40 large-scale washing machines, large-scale dryers and imported large-scale dry cleaning machines. The daily washing capacity of Guyi has more than 4,000 pieces and the daily dry cleaning capacity has more than 3,000 pieces.

Since the reform and opening up, Zhengzhang has entered the fast lane of rapid development. Zhengzhang people seized the development opportunities and insisted on the path of "technology and development of business". In order to make washing household, the company organized technical forces to summarize and organize the valuable washing experience accumulated over 80 years, and combined with the characteristics of ordinary household washing and modern technology, it has developed a series of outstanding characteristics, stable performance and convenient use. , "Zhengzhang" brand daily washing products with excellent taste. "Oil Hoist" is a well-known product of the company and enjoys a high reputation in the minds of consumers. Zhengzhang brand has become a well-known brand in the national detergent industry.

In 1997, Zhengzhang Dyeing Company was included in the Shanghai Jiubai Group and Shanghai Jiubai Co., Ltd. Currently, the company is the vice president unit of Shanghai Dyeing Industry Association.