The move could be a bid to overcome tensions with the West over the Syria conflict and to strengthen its relations in Africa, where it is a major buyer of oil and other resources, diplomats and experts said.
France, which intervened in the west African nation in January, hopes to hand over to UN peacekeepers in July. More than 6,500 African troops are already in the country but the UN is looking for at least 3,000 more to bolster the force.
"China has offered between 500 and 600 soldiers," said one senior diplomat yesterday. "We don't have detail yet on what kind of troops they would be providing."
"It is a significant move by China," said another UN diplomat confirming the numbers. Both diplomats spoke on condition of anonymity as talks between UN leaders and China are not yet completed.
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At least 155 of the Chinese troops are expected to be engineers, according to a UN official who confirmed talks are underway.
China rejected UN peacekeeping missions as an unwarranted interference when it joined the United Nations in 1971. It contributed its first peacekeepers in 1992 and has since stepped up its presence though they have not taken part in military operations.
China's UN mission did not immediately answer calls seeking a comment on the Mali mission talks. But Chinese ambassador Li Baodong has signalled support for the battle against extremists in Africa.
The UN force in Mali, to be known under the acronym MINUSMA, will take over from French troops who halted an advance by Islamist guerrillas who had controlled the northern half of the country for 10 months. The guerrillas are now staging attacks from desert and mountain hideouts.