The construction management planning of mega infrastructures entangles numerous overall decisions and complex issues, yet the related information remains inadequate. It thus could not merely rely on conventional rule-based planning strategies. This research focuses on the scenario planning of mega infrastructure construction management planning, aiming to reveal the logical process of scenario planning and develop a theoretical framework for the scenario planning of mega infrastructure construction management planning. Based on a case study of Huangmaohai link project, it identified the major elements and logical relationships among elements in scenario planning of mega infrastructure construction management planning. A theoretical framework for scenario planning of mega infrastructure construction management planning was developed accordingly. The findings indicate that the logical process of mega infrastructure construction management planning involves iterative scenario planning among expected future scenarios, situation analysis, and pathway simulation and selection, until key problems are fully addressed. This study is conducive to enriching the theoretical system of mega projects in China and providing guidance for mega infrastructure construction management planning.