New President Xi Jinping has hailed the strength of China's ties with African nations.
Mr Xi described Africa as "a continent of hope and promise".
He was speaking in Tanzania - the second country he has visited since taking power 11 days ago.
Addressing leaders at a conference hall built by China in Dar es Salaam, he said trade between China and Africa topped more than $200bn (£130bn) last year.
Mr Xi and his Tanzanian counterpart Jakaya Kikwete signed 16 different trade agreements including improvements to Tanzania's hospitals and ports, and the building of a Chinese cultural centre.
The Chinese leader is expected to arrive in South Africa on Tuesday to take part in an emerging economies' summit.
He will wrap up his African tour with a visit to Congo-Brazzaville.