China's 11 largest publicly-traded banks may need to raise about 300 billion yuan by selling shares and bonds to ensure they have adequate capital for credit growth, according to BNP Paribas.

The lenders would need as much as 368 billion yuan to keep their capital ratio at 12 percent, BNP said in a note to clients on Friday. Bank of China Ltd, the nation's third-largest by market value, would need 137 billion yuan.

The government has encouraged a $1.3 trillion credit boom this year to complement its monetary and fiscal stimulus plans, propelling the economy last quarter to its fastest pace of growth in a year.