A high speed painting automizor system with elastic support is presented. Experimental tests of the system including the key part, the rotor-bearing system, were conducted using the experimental modal method under various working conditions. The natural frequency of the system is given and the relationship between the bearing stiffness and the natural frequency and amplitude are studied. Fault of the bearing GCr15 is analyzed. The experiment has three parts including the experimental theory, experimental design, and experimental data processing. The results will lay a solid foundation for further investigation on dynamic design, maintenance, working condition monitoring and fault detection of the painting automizor system.