British banking giant HSBC said its preliminary purchasing managers' index (PMI) reading for this month came in at a four-month high of 50.1, up from 49.7 in January.
PMI readings above 50 point to expansion, while anything below suggests contraction.
The index, compiled by information services provider Markit, tracks activity in China's factories and workshops and is a closely watched indicator of the health of the Asian economic giant.
For the first time in more than two years, the official figure for January showed manufacturing activity contracting, coming in at 49.8, a decline from 50.1 in December.
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Despite the improvement in the HSBC survey, the bank's chief economist for China Qu Hongbin said the result was mixed, stressing that while domestic demand showed some strength, new export orders contracted for the first time since April last year.
"Today's data point to a marginal improvement in the Chinese manufacturing sector going into the Chinese New Year period in February," Qu said in the HSBC release, referring to the week-long holiday which can heavily impact monthly economic statistics.
China's leaders are trying to pull off a managed slowdown of the economy to make expansion more sustainable and led by consumer spending, as in other major economies.
The growth slowdown in China last year -- gross domestic product rose an annual 7.4 per cent in 2014, a 24-year low -- prompted some intervention by authorities.
The People's Bank of China (PBoC), the central bank, cut the percentage of funds banks must hold in reserve across-the-board earlier this month, seen as a way to free up more cash for lending and stimulate growth.