A rapid and sensitive method of pseudo reversed phase liquid chromatography（pseudo-RPLC） was developed for the analysis of caffeine in milk tea.The samples were separated on a bare silica column coupled with aqueous-rich mobile phase（pH 2.9,0.03 mol?L-1sodium formate-acetonitrile,95∶5）,and tested within 5 min.The calibration curve was linear in the concentration range of 0.2-1 000 mg?L-1 with correlation coefficient of 0.999 5.The recoveries at a spiked level of 20 mg?L-1 ranged from 98% to 103% with RSDs 1.9%-3.6%.