Combined with pump laser and high-speed digital camera, a new dynamic photoelasticity method is developed, in which the traditional Cranz-Scharding camera is replaced by a new photography system. The new dynamic photoelasticity method was applied in the blasting mechanics, and some digital images, which were much clearer are got. Compared with the traditional dynamic photoelasticity system, the new digital laser dynamic photoelasticity experimental system possesses longer recording time, higher sampling frequency; the results are much more reliable and easy to be processed automatically. It is shown that the new dynamic photoelasticity is useful in the field of blasting mechanics.