Objective To investigate the remanent SO2 in characteristics of Chinese herbal medicine of Anhui. Methods The authors collect 43 samples from Chinese medicinal material markets in Bozhou， drugstore in Hefei and chinese medicine hospital in Hefei， and use acid-base titration in Chp 2015. Results According to the Chp 2015， except for yam， fenge， tianma， snakegourd root， white paeony root， Atractylodis macrocephalae， which are standard by contenting sulfur dioxide no more than 400 mg/kg， the others that content SO2 no more than 150 mg/kg meet standards， the number of the samples collect from Chinese medicinal material markets， drugstore， Chinese medicine hospital， which exceed criterion， are 4， 5， 3， respectively. Conclusion Until now， there remains the phenomenon that remanent SO2 in Chinese traditional medicine exceeds standard. The related departments should formulate special inspection requirement to make sure the safe medication of Chinese traditional medicine.