A cyclist rides past the People's Bank of China in Beijing.

A bitter turf war between China's two most important financial regulators is hampering policy co-ordination just as the country's debt-laden financial system is starting to show signs of real strain.

The China Banking Regulatory Commission and the People's Bank of China, the central bank, have always been rivals, but now rising tensions are obstructing reforms and efforts to tackle risks in the financial sector, according to officials from both agencies.