The People's Bank of China repeated its call for the world to cut its reliance on small set of reserve currencies on Friday.
In its annual financial stability report, the central bank said it saw serious defects in one currency dominating the global monetary system, a cloaked reference to the dollar.
The PBoC also issued a warning to the US over its loose monetary and fiscal policies, urging closer supervision of those countries that issue the main reserve currencies.
The value of the dollar is of concern to China, given that around 65 to 70 per cent of its $1,954bn in foreign exchange reserves, the world's largest, are thought to be held in the US currency.