I n der Arbeit werden die klassischen Randwertaujgaben der linearen Thernaoelastizitatstheorie fur Kiirper U mit stiickweise stetigem elastischen und thermischen Aufbau gelost und Regularitatsbeweise gegeben. Uubei werdea lungs ded geschlossenen Unstetigkeitsflachen St = aDi i m Innern des Korpers D = D, $-D, 4-. . . -1-U , zugelassen: (a): (b): (c): I n this paper the three classical boundary value problems i n linear Thertnoelasticity for bodies D = D, f U , f . ' ' -1-+ D, of piecewice continuous elastical and thermical structure are solved under three conditions nlong the cloaerl surfaces St = aD, of discontinuity bounding the different materiala Di: ( a ) : all components of the strain vector cross LY~ continuously. (b): only the normal components of the strain cross Si continuously. (c): there are no conditions for the strain vector along Si at all Si.Regularity proofs up to the boundary are given.