Posts on both the website of the People's Liberation Army and the official Xinhua news agency said the J-20 fourth-generation fighter had been armed and officially commissioned into China's air force.
Long touted as China's answer to US F-22 and F-35 stealth fighter jets, analysts say the J-20 is intended to fulfill two roles, air-to-air combat and ground attack.
"The stealth jets will improve the air force's comprehensive fighting ability and enable it to better safeguard China's sovereignty, security and territorial integrity," Shen Jinke, spokesman for the People's Liberation Army (PLA) Air Force, is quoted as saying by Xinhua
A report last year from the China Power Project
at the Center for Strategic and International Studies suggests the J-20 could be used to strike enemy airfields and command centers in the ground attack role.
The report also points out that if long-range air-to-air missile are mounted on the J-20, it could threaten key components of the US air fleet, such as aerial refueling tankers and early warning and command and control aircraft.