In strongly correlated electron systems, new phenomena can appear due to a complex combination of degree of freedom of the electron (charge, spin and orbital). To understand the mechanism, it is important to obtain the information of not only basic structure but also the dynamics of materials with strong electron correlations. Our laboratory uses neutron diffraction and spectroscopy to explore the structure and dynamics. Especially, we focus on a research of high-transition-temperature (high-Tc) superconductivity and study the spin excitations and phonons in several high-Tc superconductors. For the measurement, we also grow necessary high quality single crystals in our laboratory.