what efforts Sui Wendi did to unify north chinese and south chinese?

In 581, Yang Jian, a relative of the Northern Zhou empress, dethroned Emperor Jingdi and made himself emperor. He changed the state title to Sui, and named himself Wendi. Then, Yang Jian destroyed the Chen Dynasty in southern China and reunified all of China.As a result of the reunification, the society became stable and peaceful which encouraged economical and political development.