用薄层扫描法测定茶多酚中咖啡因的含量，在波长２５４ｎｍ下荧光定位。平均回收率为１０１２％，ＲＳＤ％＝２５２％，方法简便、快速，准确度与精密度好，最低检测为０２μｇ。 The contents of caffeine in tea polyphenols were determined by TLC scanning and the fluorescence was localized at 254 nm. The average recovery rate was 1012%, RSD% = 252%. The method was simple and rapid, the accuracy and precision were good, and the lowest detection was 02 μg.