Abstract: TLE data provided by the ELSETS space debris catalog database is one of the main sources for publicly obtaining orbital information. Due to the fluctuation in the accuracy of TLE data, it is difficult to further improve the orbital prediction accuracy of TLE data orbit determination results obtained by traditional static orbit determination methods. Therefore, based on the simplex optimal search algorithm, this paper introduces a time variable and solves it together with other orbital elements to achieve dynamic orbit determination. This paper conducts experiments using eight satellite with their TLE data and GPS data. Compared with the orbit determination results of the simplex optimal search algorithm without considering the time variable, the orbital prediction accuracy is improved by 18.85 - 70.3%, and the errors are significantly reduced in S and W directions. Especially for some satellites, the true position error of orbit prediction within one day has been reduced nearly to 0km.