Abstract: In the continuously developing economic and social environment, the popularity of higher education is increasing. The college entrance examination and the postgraduate entrance examination are important in the work of the higher education entrance examination. The establishment of scientific, comprehensive and objective evaluation system and decision model will contribute to the further optimization and improvement of college admission system. Extenics is used to quantitatively analyze college entrance examination and postgraduate enrollment and some improvements are proposed. As for the college entrance examination, from the perspective of students’ development, the correlation function is established, the correlation before and after the reform calculated, and the impact on students and the promotion effect of the college entrance examination reform on the development of students quantitatively analyzed. As for the postgraduate entrance examination, using the extension analytic hierarchy process and Delphi method, a decision-making model is established for the admission of transfer students to guide the admission.