  In this paper, a new type magnet is proposed and processed to uniform the
transverse beam profile. Compeared to the octupole, the new type magnet can
prove a similar octupole magnet field in the middle, but the rise rate declines
quickly in the edge. So that, a same uniform beam is got with less particles
loss. Besides that, a mechanical structure is added to adjust the width of the
middle region to satisfy different transverse dimensions, and this whould
further reduce particles loss. Some numerical simulations have been done
respectively with the octupole and the new type of magnet to show the
advantages of the new type magnet.
