China's current account surplus, the broadest measure of its trade surplus, fell 21 percent to 28.8 billion U.S. dollars in the first quarter, the foreign exchange regulator said on Monday.

The surplus under the financial account, which measures the net capital inflow, increased 41 percent from a year ago to 86.1 billion U.S. dollars, the State Administration of Foreign Exchange (SAFE) said on its website.

The data was released after revision, SAFE said.

The foreign exchange reserves increased 138 billion U.S. dollars in the first three months, excluding effects of changes in the exchange rate and asset prices.