The Earth Simulator is a parallel vector supercomputer system of the distributed-memory type, installed at the Earth Simulator Centre, in Yokohama, Japan. It has been at the position of the world's fastest supercomputer since 2002. After some introduction of the Earth Simulator, we present the results of three dimensional MHD simulation of solar emerging flux and magnetic reconnection carried out on the Earth Simulator. In the case of emregence of magnetic sheet, we found that filamentary structure arised due to Rayleigh-Taylor instability. Then many filamentary current sheets were formed in the emerging flux, supporting the iear that the corona are heated by dissipation of small scale current sheets. We also found that magnetic reconnection between the emerging flux and the coronal field occurs in spatially intermittent way. We also present some preliminary result of the case of emerging twisted flux tube and its reconnection with ambient field.