Using quantitative method and model, from three aspects such as the degree conferring unit, discipline and the Dissertation instructor, this paper conducts the statistics and analysis of the selection results of the National Excellent Doctoral Dissertations, and draws the following conclusions: (1) Excellent Doctors have formed a core group of “985 Project” colleges and universities and China Academy of Sciences; (2) Science and engineering accounted for 67．79% of the total outstanding doctoral dissertations, showing the problem of uneven development of the discipline and the unreasonable structure; (3) instructors and the number of Excellent Doctoral Dissertations obey Lotka distribution: f (yx) = 0．759/x 3．302, and the instructors of awarded Excellent Doctoral Dissertations highly correlates to Appraisal Group, Pearson correlation coefficient is 0．974, appearing the problems of selection mechanism to some extent．