  We propose theoretically an effective scheme for braiding Majorana bound
states by manipulating the point potential. The vortex pinning effect is
carefully elucidated. This effect may be used to control the vortices and
Majorana bound states in topological superconductors. The exchange of two
vortices induced by moving the potentials is simulated numerically. The
zero-energy state in the vortex core is robust with respect to the strength of
the potential. The Majorana bound states in a pinned vortex are identified
numerically.
