Since combined craniofacial resection made it possible to resect anterior skull base tumor, it has become a choice of treatment of tumor involving anterior cranial fossa. The successful outcome of this operation depends not only on the complete extirpation of the tumor, but also on the water-tight reconstruction of the bony defect. In case of a central or small defect, there are little problems in reconstructing it. But there are still some limitations in reconstructing large or lateral defects. We experienced 9 cases of sinonasal tumor treated with craniofacial resection from Jan. 1990 to Jul. 1992 at Severance Hospital. We have utilized inferior based pericranial flap in 6 cases, forearm free flap in 3 cases. We successfully reconstructed all patients except 1 case of free flap. We think pericranial flap is useful to reconstruct central small to medium defect and radial forearm free flap or temporalis muscle pedicle flap can be used for larger lateral defect with pericranial flap.