Al-CuO composite bridge films were successfully deposited on the substrates by means of magnetron sputtering. The morphology and phase constitution of the prepared samples were investigated by SEM and XRD. The Al-CuO composite bridge film was ignited using a constant voltage power supply. The current variations of Al bridge film and Al-CuO composite bridge film were compared. The phase constitution of the composite bridge film after ignition was investigated by XRD. The ignition process of the composite bridge film was recorded by high speed photography. The results show that the composite bridge film has a layered structure,that the films consist of homogeneous and approximatively spherical nanocrystals and that there is a redox reaction initiated by the heat generated from electrification in the Al-CuO composite bridge film.