It is difficult to simulate the long-distance transport of charged particle clusters above kilometer level by using particle simulation methods directly. To solve this problem, based on the electrostatic model, the moving window technology was introduced to make the 100-meter particle transmission moving window advance with the movement of the cluster, and a long-distance transmission model of the charged particle cluster was established. Compared with the radial expansion characteristics of the charged particle cluster obtained by the simulation with the calculation results of the envelope equation, the two are in good agreement, which proves the feasibility of combining the moving window technology in the simulation study of the long-distance transport of the charged particle cluster and the rationality of the transmission model. This model was further used to analyze the long-range transmission process of the 100 MeV relativistic electron beam cluster and the changes of its internal parameters and self-generated field. It was found that the self-generated electric field and magnetic field of the beam are in a highly symmetrical distribution in the radial direction, and in a slightly forward distribution in the axial direction. At the same time, the axial velocity distribution of the particle inside the beam also changes.