By using the principle of staionary potential energy, a refined theory for sandwich plates faced with laminated composites is established on the assumption of layer-wise smooth displacement vector. which accounts for continuous or compatible conditions of transverse shear stresses at interfaces and on boundary surfaces. The governing equations include seven unknown functions. The theory can be treated as the refined form of the Librescu's model. The transverse shear stresses at interfaces which are smaller but rather important in engineering can be calculated from this theory.