The purpose of fiber drop analysis technique is to measure the characteristic parameters of liquids using optical methods.The optical fiber fingerprint drop trace（FFDT）is the curve of light intensity change with time.The fiber micro-drop sensor is used to monitor the intensity in the process of the liquids by a pair of fibers.Different liquid samples of many kinds of preparation of Chinese traditional medicines are tested by using fiber micro-drop sensor in the experiments.The FFDT of preparation of Chinese traditional medicines with different volume fraction are analyzed in different ways.The linear equation of two examples are obtained.A new method is provided for online monitoring of Chinese traditional medicines and identification.