In the seminar I will talk about polarizer at TRIUMF ISAC which uses collinear optical pumping, our beta-decay spectroscopy at TRIUMF with polarized beams, our activity at RCNP Osaka using low-energy radioactive beams, namely 17N induced fusion reactions to search for high-spin isomers, and our recent activity in RIKEN on the beta-gamma spectroscopy with very neutron rich nuclei. I will talk some details of the polarizer.