They reached the summit on Sunday after a tough climb lasting more than eight hours and spent 77 minutes there erecting a survey beacon and using GPS and radar devices to measure the mountain's height, China Daily said.

The official height of the mountain, the world's tallest peak straddling China's border with Nepal, is currently 8848m, but it is believed to be getting taller, the Chinese Academy of Sciences (CAS) has said.

It was last measured in 1975.

"The re-measurement of Mount Qomolangma (Everest) has achieved decisive success," expedition leader Zhang Yanping told Xinhua news agency.

Hu Jianguo, a researcher from the Chinese Academy of Surveying and Mapping, said researchers will calculate the height of the mountain through averaging data obtained from six measurement points.

China Daily said the first data was already available but the final verdict on the height of the mountain would not be given until August.