Investigate the vibration of the rectangular plate related to the liquid, normal body frequency and modes shapes of cantilever plate without and with hole and perforate plate with 169 hole in air and contact of the water surface and immersed in water are presented using finite element method via ANSYS15 software. Acoustic model in three dimension domain is considered using APDL program to take the variables. The gotten comes about detailed the 6th plate normal body frequency and mode shapes which are based upon the behavior of the plate. In all cases, there are diminished with in the natural frequency of the fluid–structure framework. It can be concluded from our work that the exactness of the predicted frequencies utilizing our demonstrate is either exceptionally great or at slightest adequate for commonsense purposes.