T stands for special major, which is an undergraduate major specially set up to meet the needs of national strategy and scientific and technological development. K stands for control major, that is, controlling the number of colleges and universities and the enrollment scale according to the national social and economic development. KT shows that it belongs to both control specialty and special specialty, and has the attributes and characteristics of both control specialty and special specialty. According to the needs of social and national economic development, the control major controls the number of colleges and universities offering this major and the enrollment scale. Therefore, it is difficult for control majors to have "overcapacity" and supply exceeds demand. Although the employment field is relatively narrow, the employment prospects are promising.