In order to analyze the impact of the railway track of the WJ-7 rail fastening clip by the high speed running，using the FEA Midas finite element software to establish the finite element model of the fastener system. Based on the theory of vehicle track coupling dynamics, analysising of the stress characteristics of WJ-7 type fastener bullet strip during installation and under the influence of train impact load. Comparing to the stress position and size under static and impact stress or different impact force. Elastic bar in impact force of 1kn, 2Kn and 3 kn , which is found maximum stress occurs at the contact site of elastic bar and iron backing plate. The maximum stress is 1 853 MPa. In the 10 kN buckle pressure of the static analysis, elastic strip maximum stress also occurred at the contact with the iron plate part, the maximum stress for 1 765 MPa. With the passage of the train, the elastic strip is easy to crack propagation in this region and the final crack propagation leads to fatigue fracture. The numerical analysis results are consistent with the location of multiple elastic strip breakage and the results can provide reference for the design, optimization and safety of the elastic strip in the future.