Monday's mistake occurred on a trade with a face value of 10 million yuan ($1.64 million) of government bonds. A trader mistakenly inputted a yield of 4.20 percent, 25 basis points higher than the yield on the same bond at Friday's close, the brokerage said in a statement on its website on Monday afternoon.

The Chinese Securities Regulatory Commission blamed a trading system error for mistaken stock trades that occurred on Friday.

($1 = 6.1150 Chinese yuan)

(Reporting by Gabriel Wildau; Editing by Ryan Woo)