Lamb波的频散曲线是进行超声Lamb波无损检测的重要依据。本程序对Rayleigh2Lamb方程进行了分析，给出了无限大板中Lamb波频散曲线的数值计算方法，通过Matlab软件对求解过程进行编程，绘制出Lamb波在铝板中传播的相速度和群速度曲线，并通过试验进行了验证对推广应用Lamb波进行无损检测具有实际意义。(The dispersion curve of Lamb wave is an important basis for non-destructive testing of ultrasonic Lamb wave. In this program, Rayleigh 2Lamb equation is analyzed, and the numerical calculation method of Lamb wave dispersion curve in infinite plate is given. The solving process is programmed by MATLAB software, and the phase velocity and group velocity curves of Lamb wave propagating in aluminum plate are plotted. The non-destructive testing of popularizing Lamb wave is carried out through experiments. The measurement is of practical significance.)