Background. Daodi medicinal material is widely used in Chinese herb medication. However, there is a lack of systematic\nmethodology for identifying characteristics associated with good quality and reliable efficacy of Daodi med-material. Purpose.\nThe purpose of this study is to provide some evidence to further substantiate the use of Daodi medicinal materials. Methods. Seven\nrelevant databases were searched before July 2014. Two evaluators were responsible for screening and categorizing the results. The\ndata was analyzed with Microsoft Excel 2007 and SPSS 21.0 statistical software. Results. Overall, 107 articles were systematically\nanalyzed. Of these studies, 55.1% (59/107) focused on the methodology to assess Daodi med-material, and 38.3% (41/107) were\ninterested in med-material ingredients, soil physical and chemical properties, and the geological background system (GBS). Only\n6.5% (7/107) of studies were mainly conducted as clinical trials and animal experiments. Conclusion. Comparisons between Daodi\nand non-Daodi materials have been studied mainly in terms of the ingredients or composition of medical materials, soil physics\nand chemistry, and the GBS, and some identifying methodologies have been created to identify Daodi attributes. Until now, there\nis still no consensus of comparison criteria between Daodi and non-Daodi medicinal material. Only a few studies were conducted\nthrough animal experiments and clinical trials to determine Daodi superiority.
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