The Institute of Remote Sensing and Digital Earth of the Chinese Academy of Sciences, said that its findings are based on comparison of remote-sensing satellite images of the oil patterns on the ocean surface in the targeted area before and after the plane went missing.
It is not clear whether the oil slicks are the same as those found earlier by search and rescue forces, the institute said.
China yesterday pressed ten high-resolution satellites to look for the missing plane.
Malaysian authorities who tested the sample of an earlier oil slick near Vietnam said it did not belong to the aircraft.
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Meanwhile, a Malaysian airline spokesman here said there is still no trace of the aircraft 88 hours after its disappearance.
A total of 42 vessels and 35 aircraft from various countries have joined the rescue mission.
China, which is under pressure as majority of the passengers are its citizens, has stepped up its efforts by sending nine ships and besides number of aircraft for the search operations, Foreign Ministry spokesman, Qin Gang told media here.
It also sent a joint working team to Kuala Lumpur to coordinate the search operations with the Malaysian officials.