The Fourier transform infrared absorption spectra of Dibutyl Phthalate (DBP)/sunflower oil mixture were measured. By combining with the two-dimensional correlation spectroscopy, the measured spectra were divided into 500-1500 cm-1, 1500-2000 cm-1 and 2500-3200 cm-1 three bands for analysis. The analysis results showed that in the 500-1500 cm-1 band, the benzene ring and the functional group directly connected with the benzene ring were not sensitive to the change of DBP concentration. In the 1500-2000 cm-1 band, the C=O stretching variation of saturated carboxylic acid esters in sunflower oil were more sensitive to DBP concentration. In the 2500-3200 cm-1 band, the overlapping peaks at 2854 cm-1 and 2925 cm-1 were separated into multiple peaks at 2854 cm-1, 2873 cm-1, 2916 cm-1, 2925 cm-1 and 2940 cm-1 by using the two-dimensional correlation spectroscopy. With the increase of DBP concentration, the telescopic movement of CH2 was more obvious than that of CH3. The results showed that the combination of Fourier infrared spectroscopy with two-dimensional correlation spectroscopy could provide new ideas and methods for the rapid detection and migration of plasticizers.