It is significance to explore the quality status and characteristics of the national defense students based on the competency of grassroots officers. 240 grassroots officers and 232 national defense students are tested by the questionnaire of the competency of grassroots officers in two stages, The results shows: the competency of grassroots officers is evaluated in terms of the following six aspects: loyal and adaptation, impact characteristics, sense of responsibility, cognitive characteristics, management characteristics, democracy service. Outstanding grassroots officers are different from national defense students on the awareness of the quality of grassroots officers. This research further exams the disparities and features of different variables in all dimensions, and proposes measures for improving the quality of national defense students.