Inorganic arsenic was the predominant species detected in all of CHMs samples with the proportion of 94e100%. Inorganic arsenic levels in CHMs from fields and markets or pharmacies ranged from 62.7 to 550 ng/g and 94 to 8683 ng/g, respectively. The highest concentration of inorganic arsenic was found in the flowers of D. morifolium from pharmacies. The study provides useful information for a better understanding of the distribution of arsenic species in Chinese Herbal Medicines. In addition, the risk of inorganic As in CHMs from markets or pharmacies to human health should be paid more attention further.