The world's second-biggest economy has been facing pressure from trading partners to rebalance trade as its surplus with many countries balloons.
Data released on Saturday by the National Bureau of Statistics showed that China's official manufacturing purchasing managers' index fell to 49.3 in October, compared with 50.1 in September and 49.8 in August.
The PMI is based on a monthly survey of companies and measured from 0 to 100. Readings below 50 indicate contraction while readings above 50 reflect expansion.
Several key subindexes were also in contraction territory in October, including new export orders, which fell to 48.7 from 50.0 in September. The subindex on production dropped to 49.8, from 51.7.
Chinese companies have been shipping more goods abroad to find buyers at a time of weakened domestic demand, which is being dragged down by China's property sector downturn.
But an increasing number of the country's trading partners are complaining about growing trade deficits with China, arguing that an influx of cheaper Chinese goods has hurt the competitiveness of their domestic industries.
The 27-nation European Union has been highlighting what it says is an unsustainable trade deficit with China that hit $US1.1 billion a day in 2025.
The EU has taken measures to rebalance trade including striking a deal with Beijing to cap the imports of Chinese hybrid vehicles.
China has been exporting more to trading partners in Europe, Southeast Asia and Latin America since the US imposed higher tariffs last year.
Some economists have forecast that China's exports are likely to remain robust for the rest of the year and that its overall trade surplus in 2026 could surpass last year's record $US1.2 trillion.
Trade is also likely to be on the agenda during US President Donald Trump's expected meeting with President Xi Jinping in mid-November on the sidelines of the Asia-Pacific Economic Cooperation summit in Shenzhen.
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