The East Asian intraseasonal oscillation (ISO, 30－60 day) in the summer of 1998 is simulated by using a variable-resolution atmospheric general circulation model LMDZ4 developed by the French National Center for Scientific Research (CNRS) Laboratoire de Météorologie Dynamique (LMD).  The model can simulate the evident periodic signal of intraseasonal oscillation in East Asia in the summer of 1998, and the basic propagating features including the meridional northward propagation and zonal westward propagation. The simulation of the ISO kinetic energy strength is strong in low latitude region but weak in middle latitude region. In addition, the model can reproduce the dominant scale of the precipitation intraseasonal oscillation although with some deviations. The observation results show that there are three precipitation centers at about 15°N, 27°N, and 37°N in the course of northward propagating, corresponding to the three rain belts. But the simulations are weak to the south of 30°N and strong in the north area, which causes the distributions of ISO high value centers to the north of 30°N. The reason of this deviation may be related to the simulation of the precipitation strength and rain belt location.