China's January official factory PMI eases to 50.4
It gave no assessment of how the change might have affected the index readings.
China's official PMI follows on from the preliminary findings of a private sector survey sponsored by HSBC a week ago, which rose to a two-year high of 51.9 in January.
The HSBC flash PMI, the earliest preview of China's economic health in 2013, offered the latest indication that the world's second-largest economy is steadily recovering from a near two-year cool-down.
The final reading of the HSBC China PMI is due at 0145 GMT.
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