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We investigate the Kondo effect in a structure which is constructed byembedding one quantum dot between a normal metal and a \emph{DIII}-classtopological superconductor supporting Majorana doublets at its ends. It isobserved that Kondo correlation occurs between the localized state in the dotand two continuum states simultaneously, i.e., the continuum state in the metaland the continuum Andreev reflection state between the metal and topologicalsuperconductor. As a result, the Kondo model Hamiltonian is topologicallyprotected by the $SU(2)_s\rtimes Z_2^T$ symmetry. Besides, the Kondotemperature has an opportunity to present three forms in turn, following theenhancement of the coupling between the dot and Majorana doublet. Thisphenomenon exactly reflects the special role of Majorana doublet in tuning theKondo effect.

SPT 2-Channel Kondo Model in the Structure of Normal Metal/Quantum Dot/DIII-class Topological Superconductor