Name : Shigehiro Nagataki Institute : Department of Physics School of Science, University of Tokyo TITLE : Propagation of UHECRs in the Inhomogeneous Source Model ABSTRACT : We have performed the detailed numerical simulations on the propagation of the UHE protons in the extragalactic magnetic fields within about 40Mpc. We show the angular-distribution images of the UHE protons assuming that the source distribution of the UHECRs is proportional to that of the galaxies of the Optical Redshift Survey catalogue. The calculations of the correlation between the images and the sources demonstrate that the number of the current experimental data can not be used in order to judge whether the source distribution is isotropic or not. It is not until the number of the detected UHECRs amounts to the order of 1000 that it is possible to distinguish unisotropic source distribution from isotropic one. Our method and the data of the next generation experiments such as EUSO will discriminate the UHECR source distribution models better.