As energy consumption grows more serious, building energy conservation is imperative. Building materials and energy systems are key to improving building energy efficiency. Developing high-performance materials to minimize envelope heat transfer and exploring integrated solar, wind, and geothermal energy systems are fundamental. Research areas include green insulation, renewables, distributed energy, storage, waste utilization, energy efficiency, and zero-energy buildings. These elements underpin future energy-efficient and eco-friendly buildings, heralding a new era of sustainable construction.