A total of 2.09 million vehicles were sold in China last month, up 9.8 per cent from a year ago, the China Association of Automobile Manufacturers (CAAM) said in a statement.
The numbers were an increase on the 6.3 per cent gain posted in April.
The pickup came despite protracted weakness in the world's second-largest economy, where growth slowed to 6.7 per cent in the January-March period, the worst quarterly expansion in seven years.
Some economists have predicted China's expansion will slow further in the second quarter.
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Auto sales in the country reached 24.6 million last year, and in October the government sought to boost the market by slashing the purchase tax on passenger cars with small engines.
Sales of passenger cars reached 1.79 million units in May, up 11.3 per cent year on year, CAAM data showed.
US automaker General Motors outperformed the overall market, reporting earlier this month a 16.9-percent surge in May sales in the country to nearly 300,000 units on the back of strong demand for its sport utility vehicles, multi-purpose vehicles and luxury cars.