The "double blind" defense scheme was introduced in this paper, including its defense organization and implementation process, as well as the role and function of the college managers, the graduate student offices, and the defense secretaries. It was implemented in the graduate defense of civil engineering graduate students in Guangzhou University in 2014 and 2015. The effect was also analyzed. The feasibility of implementation of the "double blind" defense scheme and its significance in quality guaranteeing of graduate education were preliminary discussed under the background of comprehensive expansion of postgraduate enrollment.