According to the characterization of decomposable MS-algebras in terms of triples (M, D, ϕ), where M is a de Morgan algebra, D is a distributive lattice with 1 and ϕ is a (0,1)-homomorphism of M into F(D), the filter lattice of D, we characterize complete decomposable MS-algebras in terms of complete decomposable MS-triples. Also, we describe the complete homomorphisms of complete decomposable MS-algebras by means of complete decomposable MS-triples.