The cooperative game theory in economics was introduced into the analysis of future water use uncertainty of regional water use sectors. The cooperative game theory cores of productive

domestic and ecological water supply of the whole Dongjiang River Basin and its subregions in Guangdong Province were made and future water use for each sector was allocated in a form of value range based on water decomposition model involving cooperative game theory

considering water opportunity income of water alliance consisting of each water use sector under national total water use control indicator. The water consumption index sets of the whole Dongjiang River basin and its sub regions were provided

and the control amount intervals for productive

domestic and ecological water use in the Dongjiang River basin in 2020 are 4.26~6.29 billion m

3

4.26~6.29 billion m

3

2.52~4.21 billion m

3

0.046~0.93 billion m

3

respectively. This provides an important reference for future water management of the Dongjiang River basin under water volume control.