Why did early Qing rulers such as Kangxi incorporate Han culture and government systems used by earlier dynasties?

The Qing wanted to help unify the country and thought adopting existing ideas and the dominant culture would help with this.
The Qing were forced to do this by officials from the last dynasty who remained in the government.
The Qing thought that Han culture and earlier government systems were superior to their own.
The Qing did this to make people less worried about rising taxes under their rule.

The Qing wanted to help unify the country and thought adopting existing ideas and the dominant culture would help with this. Additionally, they sought to legitimize their rule by aligning themselves with the long-standing traditions and institutions of previous dynasties. The Qing were also pragmatic and realized that incorporating Han culture and government systems would make it easier to govern and effectively administer the vast empire they had taken over.