Abstract: In this paper,the vibration of a plate subjected by fluctuation pressure from aerated flow were studied by combination of test and numerical calculation. The modal identification on line on the plate subjected by aerated flow were carried out as well as the numerical calculation. The modal parameters of the flow-elastic system may be obtained. According to the measured fluctuation pressure and lumping the continuous random pressure on the node with the coherence scale,the finite element analysis for the response was made. Also the response was measured and compared with the result of numerical calculation. It can be seen that the coherence scale may be used to analyze the couple of the continuous random pressure. Also it is shown in the identificaion on line that the attached mass on the plate from aerated flow is quite small and it is less then 10% for continuous flow.