Disperse Red 1 (DR1) and Au nanometer-size particle-doped alumina films have been prepared by the sol-gel method and then their third-order nonlinear optical (NLO) properties have been examined by the degenerated four-wave mixing method. The doped films have absorption peaks which are close to the second harmonics from KTP crystal pumped by a Nd-YAG laser. Therefore, the third-order nonlinear susceptibility chi((3)) values at 532 nm were enhanced by resonance effect and gave high chi((3)) values of similar to 10(-15) m(2)/v(2) (similar to 10(-7) esu).