Abstract: Electromagnetic propulsion as a high-technology have been attempted by scientists for years. In the past ten years, the significant achievements in support technologies (energy storage, high velocity switching, high current density in sliding contacts and synchronization) make up the strong potential for pracitical electromagnetic launch (EML) technology.The advantages of the EML are. it can launch projectile to high velocity in a short distance, lower cost, less environmental damage and without the furel weight penalty.There are two approches. RAILGUNS, powered by low-voltage DC homopolar generators, and COAXIAL SYNCHRONOUS ACCELERATORS of drive coil configuration, which are more complex but mor flexible.Potential applications include the launching of aircraft from carriers and land bases, especially it can be used for disposing the nuclear waste to outer space, or a new generation of hypervelocity artillery for missile.Because of the evident meaning for military and civil purposes, both the U. S. Department of Defense (DOD) and a number of universities have been worked in developing EM launchers and obtained a good deal of achiermeats.