In order to solving the question of neglecting inertia force and the inconformity of vibration amplitudes in solving near field acoustic levitation in the flexural mode, a new method to solve the fluid control equations of squeezing film in Arbitrary Lagrange Euler (ALE) coordinate is presented in this paper. Using this method,the relationship between levitatied amplitude and radiation pressure is calculated.After that,the levitation experiment is carried out with several different weights,and a comparison between the obtained data and the theoretic curves has been performed.The result shows that the mathematical formula is reasonable for calculating the force of ultrasonic levitation.