This paper introduces our project of the micro reactor system with fluid control devices; a micro pump, a micro mixer and a micro valve. A micro reactor creates a high speed and high efficiency chemical process and is expected to develop chemical products and medical devices for personalized medicine. The purpose of my work is to develop a micro reactor system with fluid control devices for personalized medicine. We have developed the micro reactor system with outer dimensions of 148 × 105 mm2 comprising two micro pumps, a micro mixer, a micro valve and a reactor plate made with silicone rubber. A reactor plate connects fluid control devices and forms a channel. A channel of a reactor plate is formed with various shapes in correspondence with a chemical reaction. The system is controlled with an exclusive controller. We tried the mixture experiment with water which colored red and yellow. In conclusion, we suggested that the micro reactor system is easy to handle and portable. We represent a first possible step towards portable micro reactor systems for personalized medicine by applying the example of simple reaction.