Light-leakage type photocatalytic fibers coated with a titanium oxide layer were fabricated to decontaminate aqueous waste solution. The titanium oxide layer was prepared by a sol-gel process using titanium tetra-butoxide and salt catalyst, and characterized by SEM and EDX analyses. The titanium oxide layer was sufficiently dense and stable against long term UV-irradiation in aqueous solutions. The fibers were bundled into a tube of about 3 mm in diameter, constituting a tubular reactor that promotes photocatalytic degradation of basic dyes by a single pass process.