Abstract: To achieve optimal economic performance of the electricity-hydrogen supply chain throughout its life cycle, this paper proposes a joint electricity-hydrogen planning method covering the entire chain: Grid-based hydrogen production, tube trailer transportation, tank storage, and end-use. Focusing on minimizing investment costs, it builds a multi-variable optimization model to support two key decisions. First, optimizing the site selection of grid-connected hydrogen production nodes. Second, determining the optimal capacity configuration of electrolyzers and storage tanks. By integrating power grid constraints and hydrogen supply constraints, the model quantifies the coupling between various links and achieves optimal operating costs for the electricity-hydrogen system.