Symmetric Wannier states and tight-binding model for quantum spin Hall bands in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mi>B</mml:mi></mml:mrow></mml:math> -stacked <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>MoTe</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mtext>WSe</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Motivated by the observation of topological states in $AB$-stacked ${\mathrm{MoTe}}_{2}/{\mathrm{WSe}}_{2}$, we construct symmetry-adapted Wannier and tight-binding model for quantum spin Hall bands this system. Our construction is based on symmetry analysis Bloch obtained from continuum moir\'e Hamiltonian. For parameters extracted first-principles calculations, find that can be described a defined triangular lattice with two per site valley. The given valley have same center but different angular momenta under threefold rotation. reproduces energy spectrum accurately describes phase transition induced out-of-plane displacement field. study sheds light metal dichalcogenides bilayers provides route to addressing many-body physics ${\mathrm{MoTe}}_{2}/{\mathrm{WSe}}_{2}$.