Abstract: The trajectory generator is one of the important tools for the algorithm research and simulation verification of INS and its integrated navigation system. By combing and analyzing the research status of the trajectory generator in different carriers, the design methods and main ideas of the ideal, numerical algorithm and mathematical model trajectory generators are summarized, and the research focuses are summarized. The three types of trajectory generators are simulated and compared, and the characteristics and problems of the three types of trajectory generators are analyzed . Finally, the next step of trajectory generator research is briefly prospected, which provides some ideas for the research in this field.