The application mechanism of "rainwater energy pool" is put forward. With aeolian sand as raw material, sand plastic self insulation building profile is invented to construct assembled enclosure structure; Based on the air permeability and seepage prevention technology and the honeycomb water storage self purification technology, the new air energy system of "three sources in one" of ground source, water source and air source, as well as the roof, balcony planting and vertical green wall technology are developed. Through system integration, the prefabricated sand based ultra-low energy consumption building is invented.