In the early years of the Republic of China, it spread to the third generation in Cao Shi, changed its business model, bought a large number of knife blanks, and after shaping and quenching, it was engraved with Cao Zhengxing's brand and sold at a price 30% ~ 50% higher than that of its peers. Net profit of 60 silver dollars in the peak season. Later, due to the profligacy of Cao Shi's descendants, business declined. On the eve of the liberation of Wuhan, the fourth generation of Cao raised funds to resume business.