Which should I choose for graduate students in optical engineering of Nanjing University of Posts and Telecommunications or material engineering of Hainan University? Hope to learn elder sister advice! Of course, choose the national key discipline of Nanjing University of Posts and Telecommunications, Xueshuo Optical Engineering; Hainan University's material engineering is a fill-in-the-blank major, with no teachers and no experimental conditions. National key disciplines of Hainan University (II): crop genetics and breeding, botany. Although it is a national key university of 2 1 1, its comprehensive strength is far behind that of Nanjing Posts and Telecommunications.