Abstract: The deflection property of piezoelectric ceramics needle-selecting actuator of jacquard is a key parameter in the design of its structure and control system.Based on the basic structure of jacquard′s needle selecting actuator with bimorph,the cantilever beam model with bimorph cells sticking on both sides is considered.The actuator deformation is analyzed using finite element method(FEM) regarding the process to solve piezoelectric issue.The influence of the middle elastic beam and the nature of piezoelectric layer on the deflection actuator is studied,and the correlation of the applied voltage,elastic modulus of the beam,and thickness of piezoelectric layer is analyzed quantitatively,thus providing a theoretical basis and design method for the selection and application of needle-selecting actuator.Furthermore,experiment results show that the piezoelectric bimorph used as needle selecting actuator is feasible and effective.