Based on the theories of uniform fields and micromechanics

for the 1-1 orthotropic piezoelectric composites materials（OPCM） sensors in structural damage acoustic emission（AE） test

equivalent electromechanical model is established and some equivalent electromechanicl parameters are derived

comparing these parameters the distinct orthotropic performance of OPCM is discovered.The result is gained that the sensor electrode volt outputs have evidence difference under the actions of the unilateral stress wave in x and/or z direction by finite element mothods simulation.The result of theorthotropic performace that OPCM AE sensors can distinguish stress waves from the different directions is obtained further by the designed experiment.The experiment indicates that the OPCM AE sensor has strong response to stress wave from special direction.