Abstract: Since islands in hot and humid areas are far from the mainland, the climate here is humid and hot all year round, and the conventional energy is scarce. The paper introduced the basic idea of designing and constructing ultra-low energy consumption buildings based on solar photovoltaic driven air-conditioning systems on islands in hot and humid areas, the technical route of "reverse design" and design calculation methods, and proposed the principles of thermal design and the "criteria" for the realization of ultra-low air-conditioning operation energy consumption, which were calculated through a common four-story office building as an example. The method has been applied in the construction of islands in hot and humid areas and has achieved the expected results. It has made a technical reserve for the design of ultra-low energy consumption buildings in the future large-scale island and reef construction.