Disposable breathing circuit is mating with anesthesia machine, breathing machine, and to build artificial airway. It is a channel as anesthesia gas and oxygen enter into patient's body. The circuit is made of medical plastic wiht standard connector, consist of corrugated tube, water trap, breathing bag, patient connector, machine connector, Luer port, etc. It can be well connected with monitoring facility with good breathing flexibility, no bending, no damage, and can ensure the flexibility for gas during mechanic ventilation. Also, it is easy operate, sterile safety and protect infection.