Abstract: In view of the problems such as the low automation degree and low precision in the traditional fiber optic gyroscope(FOG) static north-finding method, the in-depth analysis of the FOG dynamic north-finding principle and algorithm was focused on. The simulation model of FOG dynamic north-finding algorithm with least square method by points was established based on Simulink toolbox in MATLAB, and then the turntable rotation speed and sampling frequency which affected obviously the FOG dynamic north-finding precision, were simulatedly calculated and optimally analyzed as the key consideration. The simulation and calculation results show that, in the case of adopting the proposed parameters, when the turntable rotation speed is 4.5-8.5()/s and the sampling frequency is about 50 Hz, the FOG dynamic north-finding system can reach higher precision. The simulation model and the research conclusions can provide theoretical reference for the design of FOG dynamic north-finding system. Meanwhile, it also provides reference for the theoretical research and concrete realization of the FOG dynamic north-finding system.