  In this paper we study an s-wave topological SC with a square vortex-lattice.
We proposed a topological Majorana lattice model to describe this topological
state. We found that the Majorana lattice model is really a "topological SC" on
the parent topological SC. Such correspondence between the Majorana lattice
model and the topological SC with vortex-lattice is another holographic feature
of the topological state. In addition, the numerical calculations confirm our
theoretical prediction.
