Air cushion guide rail (air floating guide rail), clean compressed air is uniformly sprayed through a porous throttling surface (graphite or copper based), forming a stable air film of 5-15 µ m between the guide rail and the slider, achieving "zero contact" motion. Small air source (micro air station), oil-free silent compressor+0.01 µ m precision filter+0.6 MPa pressure regulating valve+2 L air storage tank, two connected in series can supply longer or larger load rails. Application scenarios: Precision measuring instruments (CMM, laser interferometer); Wafer cutting, solidification machine, lithography machine workpiece table; Biomedical testing platform (PCR, sequencer); Nanopositioning teaching demonstration in universities/research institutes.