Abstarct: The increase in large excavations in urban areas as well as construction of jetties in coastal areas has doubled importance of using retaining walls. On the other hand, recent earthquakes have prompted researchers to review deeper dynamic behavior of these types of structures in order to find ways to estimate seismic stability of them. This thesis also attempts to study a method called Peak Filtered Acceleration (PFA) to estimate seismic stability of retaining walls. This study has done only in sheet pile wall impacted on clayey soils that have anchor rod ,due to diversity of retaining wall systems. In PFA method, first model is analyzed by incremental dynamic analysis (IDA) and by plotting collapse acceleration curve of this analysis on one hand and pushover curve obtained from nonlinear static analysis on the other hand and lixnking them together that will be expressed in detail, The range of frequencies that in which probability of structural failure is most likely to be identified is determined. By specifying critical range, to control failure under a given accelerogram, a specific filter called butterworth with appropriate order and cutoff frequency can be used instead of complex dynamic and time-consuming analyzes, and the analysis result can be understood more quickly. According to the accelerogram investigated in this study, the PFA method will yield favorable results if the maximum amplitude in the Fourier spectrum of the accelerogram used is higher than the frequency range of the high-frequency structural template. The above method was investigated on a 9-meter sheet pile with anchor rod in SAP2000 software and to ensure accuracy of analysis results, model was also controlled in PLAXIS 2D software.