Because the two disciplines are not specifically ranked for educational technology, it is impossible to find the ranking of educational technology, but from the perspective of national key disciplines, there are three universities with national key disciplines of educational technology:
Beijing Normal University (covering the first-level discipline of pedagogy), East China Normal University (covering the first-level discipline of pedagogy) and South China Normal University. So if you can consider these three universities.
Attachment: Catalogue of two disciplines included in the first-level discipline of pedagogy.
040 10 1 principles of pedagogy
040 102 Curriculum and Teaching Theory
040 103 history of education
040 104 comparative pedagogy
040 105 preschool education
040 106 higher education
040 107 adult pedagogy
040 108 vocational and technical education
040 109 special pedagogy
040 1 10 educational technology