We are in charge of the NIMS Materials Database and MI²I Data Platform with respect to content development, system construction and operation management. Along with continuous data update and Internet service providing of conventional NIMS databases for inorganic, polymer and metallic structural materials, we explore new methods and techniques of data collection, processing, management and service, in order to construct materials big data. The data and data analysis tools, machine learning and simulation software developed by MI²I project will also be provide through our platform in the future.