An investigation has been performed to predict full vehicle frontal crash behaviors in collapse zone of the front side rail through the front sub-structure vehicle impact test. Attaching the front structure of a vehicle to the rear crash (FMVSS301) moving barrier makes the front sub-structure vehicle. The test condition is set-up to represent full vehicle crash mode in the collapse zone of the front side rail, a sub-structure FE model is built from full vehicle FE model. Mass and initial velocity of the model are changed so that the model has the same kinetic energy on the US-NCAP frontal crash condition. A preferable model in point of a test set-up is suggested and the analysis result is compared with the other results. The model has 1950Kg of the mass and 20Kph of the impact velocity. Even though the model has 17% of the US-NCAP kinetic energy the result of the sub-structure model look similar to that of full vehicle FE analysis in point of deformation and transmitted section force. Finally, for the sub-structure vehicle the crash test is done and the test result is compared with the analysis result. Two results show good correlation with each other. It is shown that the sub-structure vehicle crash test can be a useful tool to develop the front side rail in early design stage with saving development time and cost.