Against the backdrop of the green transformation and dual-carbon goals in the construction industry, comprehensive lifecycle engineering management for low-carbon buildings has become increasingly crucial. This paper examines the entire process, from planning and design, construction, operation and maintenance, to demolition and recycling, to analyze the core characteristics of low-carbon management and key control points at each stage. It identifies current challenges such as inadequate technology implementation, weak process control, and poor management coordination across phases, and proposes optimization strategies focusing on stage-specific improvements, collaborative mechanisms, standard development, and digital management systems. The findings provide theoretical insights and practical recommendations for enhancing low-carbon construction management and achieving carbon reduction and efficiency improvements throughout the entire project lifecycle.