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This invention relates to the field of spectroscopic detection technology, specifically disclosing a method and system for determining the composition of titanium alloys based on a spectrometer. The method includes: acquiring raw spectral data of a titanium alloy sample using a spectrometer, filtering high-frequency noise from the raw spectral data to obtain clean spectral data; detecting local minima in the clean spectral data to construct a baseline profile of the titanium alloy sample, and performing drift calibration on the baseline profile to obtain optimized spectral data; comparing the characteristic wavelength heights of adjacent elements and integrating the obtained peak data into characteristic spectral peaks; performing similarity matching between the characteristic spectral peaks and wavelengths in a preset element characteristic wavelength library to determine the intensity of the characteristic peaks; extracting element concentration data and correlating the element concentration data with the intensity of the characteristic peaks to construct a calibration curve; mapping the optimized spectral data to the calibration curve to generate composition ratio data. This invention can improve the efficiency of spectrometer-based titanium alloy composition determination.