The proposed STCF is a symmetric electron-positron beam collider designed to provide e+e− interactions at a center-of-mass energy from 2.0 to 7.0 GeV. The peaking luminosity is expected to be 0.5×1035 cm−2s−1. STCF is expected to deliver more than 1 ab−1 of integrated luminosity per year. The huge samples could be used to make precision measurements of the properties of XYZ particles; search for new sources of CP violation in the strange-hyperon and tau−lepton sectors; make precise independent measurements of the Cabibbo angle to test the unitarity of the CKM matrix; search for anomalous decays with sensitivities extending down to the level of SM-model expectations and so on. In this talk, the physics interests and the recent progress on the STCF project R&D will be introduced.