It follows a two-day summit where China signed trade deals with 10 African nations worth $US1.9 billion ($A2.46 billion).
Beijing also pledged to double its aid to the continent and deliver $US5 billion ($A6.47 billion) in loans and credits.
"We urge the developed countries to increase official development assistance and honour their commitments to opening their markets and debt relief," read a joint declaration adopted at the end of the summit.
Chinese President Hu Jintao also announced that China would cancel more debt owed by poor African countries, without saying how much.
"China will forever be a good friend, good partner and good brother of Africa," Mr Hu said in a speech at the Great Hall of the People.
The declaration urged developed nations to provide more financial and technical assistance to help Africa fight poverty and disasters, as well as to prevent and control desertification.
With leaders or representatives from 48 of Africa's 53 countries in attendance, China hailed the event as its biggest and most important international gathering since the founding of the communist regime in 1949.
The next China-Africa summit will be held in Egypt in 2009.
Major projects
According to a copy of the agreement given to reporters, the biggest deal was one involving the building of an aluminium production plant in Egypt worth $US938 million dollars.
Other deals included a $US300-million-dollar contract for Chinese firms to upgrade a highway in Nigeria, develop a $US200-million-dollar copper project in Zambia and set up a $US60-million-dollar textile business in Sudan.
Some of the other countries to also sign trade deals with China on Sunday were South Africa, Kenya, Cape Verde and Ghana.
Trade between China and Africa in 2005 amounted to $US39.7 billion dollars, nearly a tenfold increase from 1995, and was likely to reach $US50 billion dollars this year, according to Chinese officials.
Oil is a big part of that rise, with China last year buying $US38.3 million tons of crude from Africa, accounting for 30 percent of its oil imports, according to official statistics.