|Nano technology (NT) is one of the key technologies in 21st century, constituting the backbone of many convergence technologies. It has diverse applications, including semiconducting device, drug screening, disease diagnosis, and so on. One of the most important application areas of NT is measurement standard or metrology. With the help of the nano-scale devices and the super-sensitive sensors, a new measurement becomes probable with the unprecedented precision. KRISS is one of the key players of NT research in Korea, having two decades of NT research history. We have produced many valuable results, fruitful for industry, academia, and global metrology society. In this presentation, I will give brief introduction on the history and role of KRISS as a National Metrology Institute (NMI), which is followed bygeneral overview of our on-going activities on NT research.