Abstract: The tensile mechanical properties of two industrial TRIP steels, K(0.091% C-1.456% Si-1.061% Mn) and B(0. 134% C-1. 525% Si-1.226% Mn), at high strain rate were investigated with a selfdesigned pneumatically actuating tensile impact bar-bar tester and compared to the quasistatic tensile behavior. The results showed that their tensile properties at room temperature exhibit consistent trends and are far more sensitive to strain-rate in dynamic tension than in static mode. Because the stable retained austenite in TRIP steels transformed to martensite during tensile test and the materials exhibited excellent transformation induced plasticity, the plastic deformation behaviors were evidently improved.