The three images show what appear to be large, floating objects in the South China Sea. Previous sightings of possible debris have proved fruitless.
Malaysia Airlines plane went missing on Friday with 239 people on board.
The aircraft vanished about an hour after it took off from Kuala Lumpur as it flew south of Vietnam’s Ca Mau peninsula.
No distress signal or message was sent.
The three images were taken on Sunday, a day after the plane disappeared, but were only released on Wednesday on the website of China’s State Administration for Science.
Map co-ordinates place the objects in the South China Sea east of Malaysia and off the southern tip of Vietnam.
China’s official Xinhua news agency says the largest of the objects measures about 24m x 22m (78ft x 72ft).
China has deployed several high-resolution satellites – controlled from the Xian Satellite Control Centre in northern China – to help search for the jet, the People’s Liberation Army said on Tuesday.
Earlier, Malaysian authorities revealed that the last communication from the jet suggested everything was normal on board.
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