A micro transfusion system faced to community hospital is presented.The system has real-time monitoring and alarming(when there exit abnormal instance or the transfusion is completed) functions,which well settle the inconvenience of venous transfusion in clinic,and increase the security and efficiency.In this system,the Photoelectric sensor technology and signal processing technology are applied to acquire the reliable detection of the transfusion.And microcontroller(MCU) and digital display technology are employed to count,display and monitor the quantity and velocity of the liquid,and alarm when there has no liquid or a jam.Moreover,the network technology is also added to the system to realize tele-monitor.At last,the authors briefly introduce the status of the system's application,and point out system's flaws and the main work in the following research.