Recent results at the Slow Positron Facility (SPF), Institute of Materials Structure Science (IMSS), KEK are reported. Studies using the total-reflection high-energy positron diffraction (TRHEPD) station revealed the structures of rutile-TiO2(110) (1x2), graphene on Cu (111) and Co (0001), and germanene on Al (111). First observations of the shape resonance in the Ps-photodetachment process were made using the positronium negative ion (Ps-) station. Experiments using the positronium time-of-flight (Ps-TOF) station showed significant enhancement of the Ps formation efficiency and the energy loss in the Ps formation-emission process. A pulse-stretching section has been implemented, which stretches the positron pulse width from 1.2 mu s up to almost 20 ms.