A self-referenced dual mode surface plasmon resonance sensor based on Au/ITO nanocomposite material was designed. The proposed sensor can generate two resonance peaks namely resonance peak 1 and resonance peak 2. The results reveal that the resonance peak 1 has larger drifts with the changing of the refractive index of measured medium and the incident angle, but the resonance peak 2 drifts only with the change of incident angle. Two peaks are cross-referenced, and the influence of the incident angle shift on the measurement results is reduced, which improves the accuracy of the measurement results. We investigate the effect of the incident angle, refractive index of sensing medium and thickness of the thin film on two peak of wavelength with different volume fraction of nanocomposite materials. When the incident angle θ is 80°, the volume fraction of Au f is 0.65, film thickness d is 40nm and d is 45nm, and the volume fraction of Au f is 0.85, film thickness d is 45 nm and 50 nm, the resonance peak 2 does not vary with the change of the refractive index,only the resonance peak 1 varies with the change of the refractive index to achieve the desired state of self-referenced sensor.