  Twisted bilayer graphenes with magical angle exhibit strongly correlated
electronic properties because of the isolated flat band at the Fermi level. We
studied the twisted bilayer graphene with substrates on both layers. The
substrate induce Kekul$\acute{e}$ distortion for each graphene layer. The
systems are investigated by both continuous Dirac Fermion model and tight
binding model. The two investigations give similar conclusion that isolated
flat band with ultra-narrow bandwidth could appear.
