The announcement by the governor of the industrial province of Liaoning comes as the world's second-largest economy prepares to release 2016 data that is tipped to show the slowest growth in more than a quarter of a century.
China's Gross Domestic Product (GDP) figures are a closely watched measure of economic growth in the country, which affect business and financial decisions around the globe.
Speaking at a legislative meeting Tuesday, Liaoning's governor Chen Qiufa admitted that from 2011 to 2014, economic data from the province's cities and counties had been plagued with false statistics, the official Xinhua news agency said.
In one 2013 case, a county reported its government revenues were 127 percent more than the actual figure, Xinhua cited the country's top anti-graft authority and National Audit Office as saying.
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Following the fraud-busting investigation, Liaoning in the first quarter of 2016 became the first province in years to report negative growth, according to reports at the time -- although it is unclear whether there is a direct connection.
Officials and analysts in China and abroad have long questioned the accuracy of Chinese economic figures, which many suspect are often manipulated to make the economy look more robust than it really is.
A major issue is that local bureaucrats' promotions are tied to economic performance, giving them an incentive to falsify data in hopes of improving their chances of career advancement, Xinhua cited Chen as saying.
Even Premier Li Keqiang has expressed doubts about the accuracy of the country's GDP figures.
Leaked US diplomatic cables show that as the top official in Liaoning province in 2007, he told the then-US ambassador that such data was "man-made" and thus unreliable.
"'GDP inflation' has become like a chronic disease -- it's not unique to Liaoning alone," wrote Xinhua, but even so the province's sins were "comparatively serious".
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