Biden, during his second visit to China since becoming the US Vice President, also held talks with Premier Li Keqiang and then left for South Korea.
He arrived here yesterday from Japan where he along with Japanese Prime Minister Shinzo Abe criticised the zone.
China announced a new ADIZ last month, and said aircraft flying through the zone must follow its rules, including filing flight plans.
The ADIZ covers islands claimed and controlled by Japan and a submerged rock claimed by South Korea.
The US, Japan and South Korea have rejected the zone, and flown undeclared military aircraft through it, prompting China to scramble its airforce jets to monitor them.
