 In 1952, Tsinghua DMS was merged with the Peking University Department of Mathematical Sciences.Then in 1979 it was renamed "Department of Applied Mathematics", and renamed again in 1999 to its current title.Tsinghua DMS has three institutes at present, the institute of Pure Mathematics which has 27 faculty members, the Institute of Applied Mathematics and Probability and Statistics which has 27 faculty members, and the Institute of Computational Mathematics and Operations Research which has 20 faculty members.