Objective　To investigate the quality of dissertations by analyzing the concealed evaluation results of postgraduate dissertations

and to provide a reference for improving the quality of dissertations. Methods　A total of 366 postgraduate dissertations and 1 051 concealed evaluation comments were collected from a medical university

and according to the evaluation index system of postgraduate dissertations

a horizontal comparison was made based on the overall quality and discipline. Excel and SPSS 19.0 were used for statistical analysis. Results　Eighty percent of the dissertations in unqualified category had poor topic selection

and the excellent and good rate was only 21% in Standardability. In discipline-based evaluations

the basic medicine group had a poor rate of 3.8% in Topic Selection and 2.5% in Mastery of Basic Knowledge and Scientific Research Ability

while the military management group had a poor rate of 5.6% in Innovation and Value and 1.9% in Standardability. Conclusion　Topic selection is the key to the quality of dissertations

and the groups of basic medicine and military management should improve the scientificity of topic selection and the standardability of dissertations.