Alcohol content is one of the most important quality parameters of Baijiu. In this paper， a commercially available bottled Baijiu as the research object， the rapid and in-situ nondestructive detection method of Raman spectroscopy was used to measure the alcohol content of glass bottled Baijiu. Firstly， the Raman spectra of ethanol， bottled Baijiu and empty bottle were determined. The Raman spectra of ethanol were reduced by Extended Multiplicative Scattering Correction （EMSC） pretreatment method with the Raman spectrum of the empty bottle as a reference. Then， a univariate linear regression model of Raman characteristic peak of ethanol and the alcohol content of bottled Baijiu was established. Among them， spectral model of bottled Baijiu pretreated with EMSC worked best at the Raman characteristic shift of 888 cm-1， with the determination coefficient R2 was 0.9998 and the root mean square error was 0.3077. The alcoholicity prediction model of bottled Baijiu verified by different alcoholicity liquor samples showed that the determination coefficient R2 between the predicted value and the true value was 0.9986， and the root mean square error was 0.3382. Finally， the models of different brands and different packaging Baijiu were corrected and the alcohol content was predicted based on the ratio correction method. This finding demonstrated that Raman spectroscopy could achieve the in-situ nondestructive rapid detection of alcohol in bottled Baijiu. This method， without impacting secondary sales， does not require unsealed packaging so that it brings a new technical means to the supervision of the liquor market， and also provide a technical reference for the nondestructive and rapid detection of bottled food quality and safety.