Synchrotron radiation (SR) delivers the vacuum ultraviolet (VUV) radiation with high photon flux and good resolution. The high quality of VUV from SR gives the chances for scientists to investigate the spectroscopy and photochemistry of molecules and materials in this region. With the VUV from the 1.5 GeV storage ring in Taiwan Light Source (TLS), we are conducting the scientific programs on molecular spectroscopy, atmospheric chemistry, astrophysics and astrochemistry, phosphors, and electro-optic materials with techniques of photoabsorption, photodissociation, photodesorption, photoionization, and photoluminescence currently.