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As an invaluable legacy left by our traditional culture��Traditional Chinese Medicine��TCM��is still playing an important role in China's health care system today�� In his report to the 17th CPC National Congress��President Hu Jin-Tao pointed out that the Chinese government will strongly support the development of Traditional Chinese and ethnic medicines��This policy provides us an unprecedented opportunity to carry forward and develop TCM��It is now generally recognized that Chinese crude drngs is the major material basis for TCM to prevent and treat diseases��and that its quality could largely decide the clinical therapeutic effects��As a matter of fact��quality control of Chinese crude drngs is now the biggest hurdle for the development and globalization of TCM�� Pharmacopoeia of the Peoples Republic of China��ChP��is the legal standard insuring the quality of medications in China��TLCAtlas of Chinese crude drngs in Pharmacopoeia of the Peoples Republic of China is one ofthe supplementary books of the ChP��This book uses elegant pictures and scientific words to illustrate the TLC identification ofTCM crude drugs recorded in the ChP�� The quality of TCM crude drugs could significantly influence the quality of proprietary Chinese medicines��and finally influence the safety and therapeutic effects of TCM��Thin-Layer Chromatography ��TLC��is a rapid��direct��and informative technology for the identification of TCM crude drugs��TLC could reflect their inherent quality and thus can be used for their quality control�� Reference drug materials are used in TLC analyses in this book to present the global chromatographic features of Chinese crude drngs��so as to insure the authority and applicability of the ChP�� I believe that this is unique to the present book�� This book is informative with abundant and solid research data�� All the crude drug samples used in the studies are newly collected and represent different geographical sources��The TLC chromatograms were all original data obtained by the authors��and the pictures were taken by high quality digital cameras��More importantly��this book contributes significantly to supplement and improve the TLC��methods described in the ChP��Therefore��this atlas is not only a legal standard of TLC identification of TCM crude drugs�� but also a useful collection of latest research results in this field��I am glad to notice that all the contents in this book are published for the first time�� The pictures are highly clear�� and the TLC features are easy to be determined��I believe that this book will enhance the quality control research and clinical use of Chinese crude drugs�� improve TCM development��and promote administrative supervision of TCM in China��