The evolution of Fermi arcs varying with the local surface potentials from U=0.0 V to U=0.34 V. Without potential, each closest pairs of Weyl points W i + and W i − (i=1,2,3,4) are connected by the Fermi arcs. Under different potentials, the Fermi arcs can be disconnected and rewired between different Weyl points with opposite Chern number.