Abstract: Timeintegrated spectrum of 3ω0/2 light in plasma produced by 1.053μm laser irradiating on Audisk is shown in this paper．　Based on the measurement of redshifted p eak and blueshifted peak. The temperature of electron in interacti on region and the　plasma expansion speed in onequarter critical electron density layer are obtained. The experiment results agree well with nonlinear saturation theory of Two PlasmonDecay.