Abstract: The tensile impact loading-unloading test of unidirectional glass fiber reinforced epoxy are carried out on a self-designed tensile impact setup in the first time.Combined with the results of transient temperature rising and energy analysis under tensileimpact,a perfect composed bundle model is proposed and the one-dimensional constitutive equation under tensile impact is derived.Comprehensive tensileimpact tests in the strain rate range(300-2000 l/s)for that composite are carried on.The specific constitutive equation simulated from the statistical analysis and rate-dependence analysis of the testing results shows effective and possesses obvious physical meaning.