This paper looks briefly at the design and test of air-lubricated bump foil journal bearings. The results of a lot of experiments, and the formulars for the design of geomeiric parameters of bump foil journal bearing are presented. "The structure of the test rig for high speed bearings and the experimental methods for the bump foil journal bea- ings are described (The supoorted bearings and the parts of loading equipment are all air-lubricated). The first-phase test of bump foil journal bearings with different parameters has been completed, The experimental results basically agree with the theoretical curves.