Abstract: In order to achieve the coordinated development of clean, time-varying renewable energy consumption and pollution, stable fossil energy utilization, a unified energy system for hydrogen production and storage by new energy coupling C1 chemical engineering cycle was proposed. In the context of a unified energy system, considering the spatio- temporal characteristics, application scenarios, influencing factors and forecasting methods of hydrogen load forecasting, a hydrogen load forecasting framework was established. On this basis, a hydrogen load prediction function in the fields of industry, power, heat and transportation was proposed to calculate the hydrogen load in each scenario. A rolling grey prediction method considering original data test was also proposed for the characteristics of the lack of historical information on hydrogen load prediction and the influence of multiple factors. Finally, the global hydrogen energy load was predicted in different scenarios, and the results verify the feasibility and effectiveness of the proposed method.