Roll-to-roll production technology is very important in the production of flexible electronic devices and functional films. In this presentation, I will review the results of the current research on the roll-to-roll production technology which was developed by Dept. Printed Electronics in KIMM. These include roll-to-roll gravure/reverse-offset printing system for RFID/TFT/TSP, roll-to-roll slot-die coating system for AgNW and OPV, roll-to-roll micro/nano imprinting system for functional film and roll-to-roll evaporation system for OLED lighting. For these systems, we also developed precise web handling control, printing force control, alignment control technologies and smart coating/printing process and low temperature drying/sintering process.