Abstract: Tensile dynamic behavior of unidirectional glass fiber reinforced composite(GRFP) which was used for shell of anti-explosion container was investigated in the strain rate range of 400~2000 s<sup<-1</sup<, and the one-dimensional dynamic constitutive relation was derived. The results of tests show obviously influence of strain rate to the fracture strength and strain of a unidirectional GRFP in the fiber direction.