Abstract: In order to investigate the characteristics of light flash intensity produced by hypervelocity impact, experiments on hypervelocity impact of 2024-T4 aluminum target were conducted under two kinds of experimental conditions by using an optical pyrometer measurement system established and a two-stage light-gas gun loading system. Two sets of optical fiber probes were used in every experiment: one directed to the impact point, and the other laterally directed to the impact point. Under the given experimental conditions and optical fiber probe schemes, the analysis of acquired original data show that the peak value impact light flash intensity increases with the wavelength increasing in the range from 405 to 633 nm during the hypervelocity impact of 2024-T4 aluminum target, and it d