Our group focuses on designing and synthesizing a variety of core-shell nanoparticles having different sizes and shapes that possess ultrahigh surface-enhanced Raman scattering (SERS) activities. The 2D and 3D ordered nanoparticles assembly provides high reproducibility and the capability of quantitative measurement. Gold-core transition metal-shell core-shell nanoparticles (Au@TM, where TM = Pt, Pd, Rh, Ru)were synthesized to extend SERS effect on transition metal surfaces by coating a uniform, ultra-thin transition metal-shell on SERS-active gold nanoparticles. Gold/silver-core dielectric-shell core-shell nanoparticles (Au@DE, where DE = SiO2, TiO2, Al2O3, graphene) were also rationally synthesized in SHINERS. The gold/silver core encapsulated by an ultra-thin, uniform and pinhole-free shell, can still maintain the strong plasmonic property to enhance the Raman or fluorescence signal of probed molecules nearby. We have also designed core-shell nanotips which could be used in SECM, STM, tip-enhanced Raman and Fluorescence spectroscopy.