In this paper, the measurement of dynamic stress generated in the Ti0_2 suspension induced by Nd:YAG laser beam irradiation is proposed. The dynamic stress generated in the Ti0_2 suspension by using elastic wave propagation in the cylindrical long bar made of aluminum alloy is measured. The laser induced stress intensity is evaluated from the dynamic strain measured by small semiconductor strain gauges. As a result, the dynamic stress induced by laser beam irradiation is depended on powder type and particle diameter. When the peak power is P = 4 kW, the dynamic stress generated in the TiO_2 suspension with a particle size of 0.02 um reached the maximal value, and it was 1100 Pa.