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Abstract: The market of low-altitude economy has the potential to reach trillion dollars in 10 years globally. In China, it serves as a hallmark of national strategic emerging industries, and represents new quality productive forces. Exploring innovative engineering and technologies for low-altitude economy infrastructure is expected to promote sustainable growth in this sector. The scope of the low-altitude economy spans from the ground to the air, with its infrastructure encompassing various aspects such as communication, navigation, surveillance, meteorology, and operations. In the future, it is expected to be characterized by “interoperability, intelligent interconnectivity, as well as safety and efficiency.” The integration of sixth-generation wireless communication (6G) networks, satellite-based Internet, satellite-based remote sensing, low-altitude micro-meteorology, advanced surveillance systems, and large-scale artificial intelligence (AI) models will significantly enhance the capabilities of low-altitude economy infrastructure, serving as a pivotal driver for its high-quality development. Recent years have witnessed a remarkable progress in novel infrastructure technologies for low-altitude economy. However, fundamental theory deserves more attention, especially breakthroughs in core technological R&D, and technical implementations still face multifaceted challenges.