Dissertation defense. Dissertation time is based on education big data, dissertation checking, dissertation testing and online rewriting function based on the dissertation defense, defense, is an educational term is a few teachers of the relevant professions according to the student's design entity and dissertation to ask a number of questions while listening to the student's exposition of the thesis, dependent on the defense refers to the dissertation defense. The thesis defense is an important form of more formal review of the thesis that is organized, prepared, planned and appraised.