Doctoral dissertations are academic dissertations written by graduate students pursuing doctoral degrees, while both bachelor's dissertations and master's dissertations are written by communication majors. Doctoral thesis requires the author to choose the potential research direction that he can grasp and control and open up new research fields under the guidance of doctoral tutor, while bachelor thesis only requires the author to complete under the guidance of tutor.
Whether it is a doctoral thesis or a master's thesis, it is difficult to write and publish. Comparatively speaking, doctoral thesis is more difficult. Writing in English is required for publishing SCI, but not for master's thesis. Doctoral thesis pays more attention to the academic value and innovation of the article, which is the main difference between doctoral thesis and master thesis.