Abstract: The impact has an obvious effect on inter laminar fracture of material surface. The influence of the impact on inter laminar fracture toughness is not clear at present. In particular, the influence on and the trend of the blade skin inter laminar fracture caused by the blade lead-lag have not been studied. In this paper, firstly, the dynamic response of impact load acting on blades in the case of lead-lag was studied. And the relationship of vibration-displacement-velocity was determined. Then the finite element numerical analysis of stress-strain-velocity in the case of lead-lag was carried out. According to the continuum mechanics principle, the governing equations of the pendulum impact load were established. The relationship between strain energy release rate (G) and stress intensity factor (K), which are related to the status that the blade lead-lag caused the crack, was clarified. Finally, the results of this paper were verified by measuring the fracture parameters in the impact test. The influence on and the trend of the blade skin inter laminar fracture caused by the blade lead-lag was discussed.