The figure increased by 392 billion yuan from the same period last year, according to the People's Bank of China.
The M2, a broad measure of money supply that covers cash in circulation and all deposits, increased 11.1 percent year on year to 252.7 trillion yuan at the end of last month.
The growth rate was 0.6 percentage points higher than the figure seen at the end of April, and was 2.8 percentage points higher than that during the same period last year.
The M1, which covers cash in circulation plus demand deposits, stood at 64.51 trillion yuan at the end of May. It was up by 4.6 percent year on year.
The M0, the amount of cash in circulation, went up by 13.5 percent from a year ago to 9.55 trillion yuan at the end of last month.
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