Abstract: In this paper,The application domain and developing prospect of fly ash floating beads are briefly introduced. A certain amount of physical and chemical properties of fly ash floating beads are measured and its forms and appearances are observed with microscope. The results present that the physical and chemical properties of floating beads of fly ash are micro-sphere of grayish and hollow glass beads, a part of particles contenting a small little magnetic components. The test analytical results of physical and chemical properties of fly ash floating beads, such as average moisture content of 30.74%, pH of 6.9~7.3, the rest and motion angle of 19.54~44.42 and 30.36~45.65, loss of ignition of 0.40%~5.42%, the density and compaction of 0.475~0.574 g/cm³ and 0.27~0.34 g/cm³ and particles' wall thickness of 1.44~5.41 μm, can provided the basis for reasonable application.