A method of empirical mode decomposition（EMD） modal parameter identification is proposed based on Laplace wavelet matching

on the basis of synchronization time test scheme for pressure switch.Taking a pressure switch which is used in air-conditioner of automobile as an object

experiments are conducted with hammering test and white noise excited for vibrating identification of diaphragm.Results prove that the method is able to overcome the disturbance of white nois and impulse noise

modal parameters is extracted accurately from multimoding aliasing and crowded modals

and the vibrating signal of diaphragm is identified which solves the problem of synchronization test for pressure switch.It has guidance significance to related profession.