Abstract: PMN-PT electrostrictive ceramics were prepared by columbite method, and their electrostrictive properties were investigated. The conditions for preparing the stack actuator by ceramic thick films and its properties were investigated. The results showed that the strain hysteresis of 0.94PMN-0.06PT is the lowest. The stack ceramic thick films prepared by the rolling process have high densities and good properties. When the forming pressure and the pressure during calcining and sintering are 200 MPa and 0.01 MPa, respectively, for the fabrication of stack actuator, the strain hysteresis of 0.94PMN-0.06PT stack actuator is lower than 1% and the actuator has good working properties.