During the pulse laser discrete scratching process, laser shock wave dynamic loading and interface failure are completed instantly. It contains debond, crack extension, warping, fracture and peeling which are often unable to distinguish. In order to accurately determine the critical point of the coating failure and propose a strain method to dialysis film-substrate system failure, this paper researched dynamic strain on coating surface of different theoretical models under pulse laser processing using PVDF patch sensors. The theoretical models are composed by double-sided adhesive binder, 2024 aluminum alloy substrate and 304 stainless steel foil film. The results indicate that under laser shock processing the dynamic strain on the coating surface fluctuates constantly, and then tends to steady. The whole process is finished in microseconds. The dynamic response of the coating surface is associated with interface bonding status of film-substrate system. When the film-substrate system combined well, the dynamic response's duration is long and the final strain value is small. When the film-substrate system debonded completely, the duration of the dynamic response is short and the obtained strain value is big. If the film- substrate system just began to debond, the situation will between this two pole conditions.