Abstract: Evolutionary characteristics of radiation intensity for light flash generated by shocking strongly LY12 aluminum target were studied by the way to theoretical derivation and experiment. Experiments were performed under six kinds of experimental conditions using established optical pyrometer measurement system, which was loaded by two-stage light gas gun system. One set of optical fiber probe was used in every experiment, installed directly into impact point. Relationships of light flash radiation intensity were acquired by original data from experiment combined with calibration. Experimental results show that the power exponents of rising phase and decay phase for the light flash radiation signals were between 1 and 5 under current experimental condition and optical fiber probe scheme. The maximum light flash intensity increased with impact velocity increasing at the same incidence angles of the projectile. Variations of power exponent of maximum light flash radiation intensity produced by LY12 Aluminum projectile into LY12 aluminum target were 7.5 to 9.0 for wavelength in the range from 488 nm to 667 nm.