"National Excellent Doctoral Dissertation Selection" (referred to as "National Hundred Dissertations" for short) is a work organized by the Department of Degree Management and Postgraduate Education of the Ministry of Education under the direct leadership of the Ministry of Education and the the State Council Academic Degrees Committee, aiming at strengthening the cultivation of high-level innovative talents, encouraging innovative spirit and improving the quality of postgraduate education, especially doctoral education in China. The selection of national excellent doctoral dissertations is an important measure to supervise and encourage the quality of doctoral education, which has a positive effect on cultivating and encouraging the innovative spirit of doctoral students in school and promoting the improvement of the quality of doctoral education in China. The selection begins at 1999 and will not be conducted after 20 13.