This thesis developed a LC -MS -MS method for rhodamine B in oil chili. The mass spectrometer was operated in the positive ion mode using multiple reaction monitoring. In the method, A sample was extracted with acetonitrile, Chromatographic separation was carried out on a Waters -C18 column （2.1 ×50 mm, 1.7 μm）using methyl alcohol and water （ containing 0.01% （v/v） formic acid ）. The limit of detection is 0. lng/mL, the linear plots were 0.05 μg/L - 10 μg/L. Overall recoveries were 99.5% - 106.4%, and RSD value was 1.08%- 3.07%.%建立了油辣椒中罗丹明B的高效液相色谱-串联四极杆质谱联用测定方法,该方法经乙腈提取样品,以waters-C18柱（2.1×50mm,1.7μm）分离,流动相为甲醇-0.1%甲酸水,电喷雾正离子MRM模式检测。方法检出限0.1ng/mL,线性范围0.1μg/L～10μg/L,加标回收率99.5%～106.4%,相对标准偏差为1.08～3.07%。
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