The piezoelectric Jacquard is a key component of the warp knitting machine and has been developed rapidly in the textile industry. The domestic and overseas development state and the basic principles of the piezoelectric Jacquard have been introduced in this paper. The deflection characteristics of the knitted selecting element of piezoelectric Jacquard have been analyzed and discussed using the finite element analysis software ANSYS. The effects of the piezoelectric layer and the form size of middle elastic beam on the deflection displacement have been investigated. The obtained results have been verified through the experiment. It provides a theoretical basis and method for the design and optimization of piezoelectric Jacquard.