In order to explore the output performance of the piezoelectric actuator and improve the performance of the piezoelectric driving mechanism, this research has conducted theoretical analysis and application test of the cross shaped piezoelectric inertial actuator. Firstly, the driving mechanism and structure composition of the actuator were presented; then the expressions of the elastic vibration displacement were obtained according to the elastic mechanics analysis of the actuator and the factors that affect the performance of the actuator were determined. Finally, the experimental tests of the actuator were implemented, in which the actuator was used to drive the flexible braille dot display device. The results indicated that the actuator had good work capability, obvious protrude of the flexible film bumps. The results showed that the actuator can effectively drive the system and amplify the output displacement of the flexible film bumps, and the flexible film contact protrudes obviously and has good performance. Thus, the research indicated that it is feasible and effective to drive system by using the piezoelectric inertial actuator.