On the basis of using SHS gravitational separation process to fabricate ceramic-lined composite pipes, lined multiphase ceramics with hypoeutectic composition and laminar or fiber (Al2O3 + Z(r)O(2)) euecticum base were obtained by means of in-situ crystallization, and fracture toughness of the ceramics was up to 15.96MPa.m(0.5) after Vickers IM testing. It was demonstrated from SEM observation and analyses on fracture mechanic of ceramics that crack extension was strongly influenced by bridging of fiber eutecticum, bridging of laminar eutecticum, which resulted in existence of strong shielding effect around advanced crack tip and strong toughening mechanism due to crack deflection, so that high fracture toughness of the ceramics was maintained.