利用透射式太赫兹时域光谱技术对常用塑化剂邻苯二甲酸二丁酯(DBP)进行了研究。将邻苯二甲酸二丁酯(DBP)分别融入正己烷、乙醇这两种溶剂中，置于室温氮气环境中分别获得了不同浓度的样品在太赫兹波段(0.2～1.5 THz)下的太赫兹时域光谱。光学参数计算结果表明，随着邻苯二甲酸二丁酯(DBP)含量的增加，DBP/正己烷混合溶液和DBP/乙醇混合溶液在太赫兹波段（0.2～1.5 THz）的折射率与吸收系数等光学参数随浓度均呈有规律的变化，根据吸收系数、折射率以及频谱面积与浓度变化曲线可以求得任意未知溶液DBP的含量。该研究为白酒等含乙醇饮料中塑化剂含量的快速检测提供了新的思路和方法。

This paper adopts terahertz time-domain spectroscopy to identify dibutyl phthalate(DBP), one kind of industrial plasticizer. Terahertz time-domain spectroscopy techniques are used to obtain time-domain spectroscopy(0.2～1.5 THz) of different DBP concentrations in ethyl alcohol and n-hexane at room temperature in nitrogen atmosphere. Optical parameters calculation results show that refractive index, absorption coefficient and other optical parameters in 0.2～1.5 THz band of DBP/n-hexane and DBP/Ethyl alcohol solutions correspond with concentrations. According to the absorption coefficient, refractive index and correlations between frequency-domain spectroscopy of area and concentration, it can be obtained content of DBP in any unknown solutions. The results could help to provide a new way and new method to identify phthalate acid esters (PAEs) in white spirit or other soft drinks.