Abstract: The operation mode of multi-stakeholder in the complementary coordination is one of the significant energy transitions in days to come. This paper mainly focuses on the allocation mechanism of synergistic gains of wind power, photovoltaic power, cascade hydropower and hydrogen stations based on the cooperative game theory. In order to gain the maximum output power of the coalition, the dispatch models of non-cooperative and cooperative modes are established uniformly, using the output expectation function to describe the uncertainty problem after the aggregation of multiple stakeholders of wind and PV powers. Then the Shapley Value and the Aumann-Shapley Value in the cooperative game theory are applied to allocate the synergistic gains after constructing the value function. Finally, the cases of a 5-stakeholder and Lower Yalong River Basin 50-stakeholderwind-solar-hydro- hydrogen energy systems show that the synergistic gains are highly influenced by natural inflow of hydropower, and that the collaborative operation will significantly improve the benefits of both the individual stakeholder and the cooperative coalition.