With the development of linnovative regulations on drug clinical trials in mainland China, the quantity and quality of drug clinical trials have gradually improved over the past decade. Based on the information of the clinical trials from the online drug clinical trial registration platform of National Medical Products Administration, we reviewed the data of drug clinical trials in mainland China from 2009 to 2020. A total of 8,593 clinical trials have been conducted during this period. The annual number of clinical trials has been increasing gradually, and peaked in 2017. There were 2,127, 1,051, 1,551, and 156 phases I, II, III, and IV clinical trials respectively. In addition, there were 3,441 bioequivalence studies. Trials for anti-tumor drugs ranked the highest (19.45%), followed by trials of drugs for infections and infestations (12.96%) and those for cardiovascular diseases (9.00%). Meanwhile the number of the clinical trial sites also increased annually. However, there were only 116 and 130 clinical trials of drugs for children and rare diseases respectively. The geographical distribution of the sites was uneven. This mapping review provides an overall look of clinical trials in China, which may be useful for domestic and international sponsors.