On　the　basis　of　the　anisotropic　damage　theory　and　piezoelectric　theory,　the　nonlinear　free　vibration　governing　equations　for　cross-ply　laminated　damaged　plates　with　piezoelectric　actuators　are　established.　The　Galerkin　procedure　furnishes　an　infinite　system　of　equations　for　time　functions　which　are　solved　by　the　method　of　harmonic　balance.　In　the　numerical　results,　the　influences　of　damage　parameters　and　piezoelectric　effect　on　the　nonlinear　amplitude-frequency　response　curves　of　the　laminated　plates　are　discussed,　which　results　reveal　the　inherent　features　about　the　coupled　mechanics　and　electricity.