State-run Xinhua news agency quoted an Air Force spokesman as saying that the stealth fighter has been commissioned into the force.
The J-20 is China's fourth-generation medium and long- range fighter jet. It made its maiden flight in 2011 and was first shown to the public at the 11th Airshow China in Zhuhai, Guangdong Province, in November 2016.
Its introduction could add a new dimension in the India- China air force balance as India is yet acquire a stealth fighter.