Abstract: In this paper We present the simulation of the acceleration of a 1.5MV high-current electron beam in a diode and the following transport process using a electron trajectory progiam (SLAlC-226).The design of high brightness diodes is a critical issue in high efficiency FELs.The purporc of this work is to find an optimal diode configuration and to devdopan effective method of numerical simulstion.The program is specifically written to compute trajectories of electrons in an electrostatic and magnetostatic focussing system including the effects of space charge and self-magnetic fidds.Magnetic fields may be of arbitray configurations.We have discussed effects of the applied magnetic field on the beam guality.The Computed results are compared with those obtained using EBQ code and the experimental data at LLNL.It is shown that our simulation are reasonable and therefore,the SLAC-226 code is very useful for designing of the induction Linacs.