Hackers interfered with two US satellites four times between 2007 and 2008, according to reports.
The claim is made in a draft paper prepared for the US-China Economic and Security Review Commission, according to the Bloomberg news agency.
It said the incidents involved the Landsat-7 and Terra AM-1 earth observation systems which were targeted through a ground station in Norway. The satellites are used to observe the earth's climate and terrain.
The report highlights the risks that would have been posed had the breaches involved satellites with "more sensitive functions".
The draft document notes that previous penetrations have involved individuals linked to the Chinese underground community. The Chinese government has repeatedly denied its role in computer attacks.
The BBC asked three security experts for their views:
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