Infusion system

An infusion system, comprising:

• a three-way valve, provided with a first liquid inlet for an intravenous infusion liquid, a second liquid inlet for a syringe liquid and a liquid outlet communicating with a venipuncture needle;
• an information matching structure, comprising a first identification code for identifying identity information of the three-way valve and an identifier for identifying the first identification code;
• a detection structure, comprising a first flow sensor for detecting a liquid flow rate at the first liquid inlet, a second flow sensor for detecting a liquid flow rate at the liquid outlet and a pressure sensor for detecting a pressure at the liquid outlet;
• and
• a controller, capable of to acquiring the identity information identified by the identifier and acquiring information detected by the first flow sensor, the second flow sensor and the pressure sensor, correspondingly recording the information to corresponding identity information items and controlling a warning indicator to give an alarm when the information is abnormal.