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Octane number is an important indicator for gasoline quality. Its real-time detection can guide gasoline reconciliation devices, and increases productivity. Raman spectra has a strong absorption to the carbon and hydrogen which are high in the gasoline. Raman analysis octane number possess on-line, fast, non-destructive detection comparing with other motor octane number and research octane number. This octane number detection system based on Raman spectra includes on-line detection system, Raman spectra data pre-processing, and prediction model. On-line detection system includes source, Raman spectrometer, and data acquisition system. Raman spectra data pre-processing uses Savitzky-Golay smoothing filter and standard orthogonal transformation. Octane number prediction model uses principal component analysis method.