In this paper, the characters of the 4-9-9-14 piezoelectric actuator would be analyzed, and the fuzzy controller is designed to control the rotating velocity of piezoelectric driving platform. There are many kind of analysis which are about the 4-9-9-14 piezoelectric actuator would be done in this paper, including of finding the resonant frequency of the actuator, setting the equivalent circuit, analyzing the quality factor of the actuator, measuring the temperature of the actuator surface, and doing the simulation of the circuit by IsSpice which is used to observe the characters of the 4-9-9-14 piezoelectric actuator. There is higher nonlinear character of piezoelectric material which extends different tensile length when it is given the same input-voltage. Because of this reason, the rotating velocity of the piezoelectric driving platform is always unstable. The fuzzy theory which is used for the controller designed would be used to let the piezoelectric driving platform be stable. The interface, GPIB, is used to adjust the input voltage for the piezoelectric actuator. When the input voltage for the piezoelectric actuator could be controlled, the rotating velocity of the piezoelectric driving platform could be controlled too.