The impulses of vaporized target material with solid target are measured by using the intense pulse of Q-Nd:YAG laser irradiating the solid target in quasi-vacuum. Analyzing the interaction mechanism of laser with target and vaporized target material, numerical calculation of impulse acting on the target with different laser intensity is performed with fluid dynamics theory and three-dimensional difference scheme. The comparison and analysis are performed between numerical and experimental results. The experimental results are given a reasonable explanation further. It is shown from the consistency between numerical results and experimental results that the numerical calculation model used in this paper can represent the mechanical response of the target to the laser.