What was the first dynasty in china

Xia Dynasty was the first dynasty in China.

It spanned from 2070–1600 BC 

It's believed the Xia Dynasty consisted of several clans and some evidence points that the Xia Dynasty is a legend.

The Qin Dynasty from 221 to 206 BC is considered China's first dynasty. Although China did have three ancient dynasties: the Xia, Shang and Zhou, Qin's ruler was the first to declare him self an emperor.