Mao, a controversial figure in Chinese history due to some of his disastrous policies like the 'Great Leap Forward', should be appraised correctly, Xi, also general secretary of the ruling CPC Central Committee, said as China celebrated the 120th birth anniversary of the founding father.
Mao still commands reverence among many Chinese but is also despised by critics who say his disastrous political and economic campaigns led to tens of millions of deaths.
Xi described Mao as a "great proletarian revolutionary, strategist and theorist" and underlined the need to have a correct historical view to appraise a historical figure.
"Revolutionary leaders are not gods, but human beings," Xi was quoted as saying by the official Xinhua news agency.
"(We) cannot worship them like gods or refuse to allow people to point out and correct their errors just because they are great; neither can we totally repudiate them and erase their historical feats just because they made mistakes," Xi said.
Thousands queued through the night near his childhood home in Shaoshan, Hunan, to see a huge fireworks display which is said to have lasted four hours. Many more made the pilgrimage to the village to mark the anniversary.
Chinese politicians rarely comment on the Great Helmsman as some of Mao's policies had disastrous consequences for the nation.
After victory over the Nationalists in 1949, Mao proclaimed the People's Republic and became its first leader.
Once in power, however, many of the policies he oversaw proved disastrous.
The decade-long 'Cultural Revolution' from 1966, which he launched to purge political opponents, dragged on for 10 years and ruined the lives and educations of a whole generation, making Mao a controversial figure in China.
