OBJECTIVE：To establish the fingerprint of raw produc ts and different processed products of Pinellia pedatisecta ， to determine the contents of 5 kinds of nucleosides ，and to compare the differences of components between the raw products and processed products. METHODS ：P. pedatisecta raw products ，processed products by Processing Standard of Chinese Medicine in Henan Province （called“Standard processed product ”for short ）and processed products by new integrated processing technology in the production area （called“new integrated processed product ”for short ）were collected as investigation objects （12 batches of each）. The determination was performed on SymmetryShield RP 18 column with mobile phase consisted of acetonitrile （A）-0.1％ acetic acid aqueous water solution （B）（gradient elution ）at the flow rate of 0.8 mL/min，with the column temperature of 30 ℃， the detection wavelength of 270 nm，and the injection volume of 15 µL. HPLC fingerprints of 3 kinds of P. pedatisecta samples were established by using Similarity Evaluation System of TCM Chromatographic Fingerprints （2004 A version ） ，and the similarity of fingerprints was evaluated. The chromatographic peaks were identified by comparing with the reference chromatogram. Five nucleosides （adenine，hypoxanthine，uridine，xanthine，inosine）were quantitatively analyzed. SPSS 21.0 software was used for cluster analysis of 36 batches of samples. RESULTS ：The results of fingerprint and content determination met the relevant requirements. The similarity of 3 kinds of sample with their control fingerprint were all greater than 0.990. There were 22 common peaks in the raw products of P. pedatisecta ，and 16 common peaks were identified in the 2 kinds of processed products （the same 6 peaks disappeared from 2 kinds of processed products ）. Fivecomponents were identified in 3 kinds of samples ，such as adenine（peak 3），hypoxanthine（peak 7），uridine（peak 8）， 1064056472@qq.com xanthine（peak 9）and inosine （peak 11）. Results of content determination showed that total contents of 5 kinds of nucleosides in 2 kinds of proc essed products were all· decreased；the contents of them in descending order w as raw product ＞new i ntegrated processed products ＞Standard processed products. Results of cluster analysis showed that 36 batches of samples could be clustered into 2 categories，i.e. raw product was clustered into one category and 2 kinds of processed products into other one . CONCLUSIONS ：Established method is stable ， feasible and suitable for the quality evaluation of raw products and different processed products of P. pedatisecta . Fingerprints have changed significantly and the total content of 5 kinds of nucleosides in P. pedatisecta are all decreased after processing ，but that of new integrated processed products is slightly higher than that of Standard processed products .