China's new international development bank will offer loans with fewer strings attached than the World Bank, sources said, as Beijing seeks to change the unwritten rules of global development finance.

The Asian Infrastructure Investment Bank (AIIB) will require projects to be legally transparent and protect social and environmental interests, but will not ask borrowers to privatize or deregulate businesses for loans, four sources with knowledge of the matter said.

By not insisting on some free-market economic policies recommended by the World Bank, the AIIB is likely to avoid criticism leveled against its rivals, who some say impose unreasonable demands on borrowers.