TIANJIN, China (Reuters) - New growth engines for China's economy have yet to replace the old ones, the head of the country's top economic planning agency said on Sunday.

Economic growth is still within a reasonable range, while China will push supply-side reform and appropriately expand demand, said Xu Shaoshi, chairman of the National Development and Reform Commission, at the World Economic Forum in the northern city of Tianjin.

(Reporting by Kevin Yao; Writing by Paul Carsten; Editing by Sam Holmes)