Abstract: By using TLC method the compound(这里有图片19830609-722-1.GIF) existing in its salt form was separated from its decomposed products and by-products with the developing agent consisting of acetone:methanol: water:chloroform = 12:3:3:5. Its special TLC behavior was studied and proved.It was identified by the R_f value method and the TLC-IR method. By using the dual-wavelength TLC-scanner its content was determined with iodine vapor visualization and the external standard one-point calibration method. By comparing the results obtained with different methods a new alternative sample application method is presented, with which the disadvantage of the unstability of iodine vapor method usually encountered has been overcome and the accuracy has been improved. The relative error of the recovery rate is within ± 2 %,