Spintronics starts with traditional magnetic materials to the studies of the pure spin current phenomenon in any material, including giant magnetoresistance effects, spin transfer torque, and spin-orbit torque. From the quantum spin Hall effect in the academic study to the hard disk and magnetic random access memory in the information industry of the application, spintronics is all-embracing. The focus of our laboratory in recent years is on the application of the topological insulator in spintronics and the interaction between spin wave and microscopic magnetic structures.