China's President Hu Jintao is in Cameroon at the start of a 12-day tour of Africa, aimed at strengthening economic and political ties.
President Hu is to sign a number of agreements while in Africa
Mr Hu met Cameroonian counterpart Paul Biya and signed a series of bilateral co-operation agreements.
Trade has expanded dramatically between Africa and China in recent years as China seeks resources to feed its economy and markets for its exports.
It is Mr Hu's third trip to Africa since he took office in 2003.
He is expected to inspect projects already carried out by his country in Cameroon, visiting a sports ground being built by a Chinese firm and a hospital funded by China.
Trade between the two countries doubled in 2006 from the previous year, reaching $338m (£172m), according to China's ambassador to Yaounde.
Big oil customer
Before he left, China announced $3bn (£1.5bn) in preferential loans and more aid over the next three years for Africa.
Africa supplies one-third of China's imported oil.
China has been urged to use its influence as a big oil customer of Sudan's to lobby the government in Khartoum to resolve the conflict in Darfur.
Beijing has been criticised for selling weapons to countries like Zimbabwe and flooding Africa with cheap goods that threaten local industries.
Mr Hu's tour will also take him to Liberia, Zambia, Namibia, Mozambique and Seychelles.