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In this paper, a Fuzzy Logic Controller (FLC) is proposed for Thyristor Controlled Phase Shifter (TCPS) to improve power system dynamic performance. The FLC has been designed for the TCPS which is located at the terminal of the generator in order to damp the Low Frequency Oscillations (LFO). From the first, for normal loading condition, the system with proposed controller has been simulated while the input power of generator has been changed suddenly, then the dynamic responses of generator have been presented with and without controller. Thereafter, for two states viz normal loading condition and heavy loading condition, to show the robustness of proposed controller, the system with previous disturbance has been simulated, then the dynamic responses of generator have been shown. The effectiveness of the proposed controller is demonstrated by simulation results.