Mr Xi Jinping was unanimously elected Chinese president for second term on Saturday morning at the ongoing session of the 13th National People's Congress.
Mr Xi, 64, was also unanimously elected chairman of the Central Military Commission (CMC) of the People's Republic of China (PRC), a report in Chinese state news agency Xinhua said.
In a first, Mr Xi took a public oath of allegiance to the Constitution in the Great Hall of the People.
In October 2017, he was elected general secretary of the Central Committee of the Communist Party of China (CPC) and appointed CMC chairman of the CPC at the first plenary session of the 19th CPC Central Committee.
He was first elected general secretary of the CPC Central Committee in late 2012, and Chinese president and CMC chairman of the PRC in March 2013.
In 2007, Xi joined the central leadership as a member of the Standing Committee of the Political Bureau of the CPC Central Committee.