A stent delivery system is disclosed which is capable of more reliable deployment by virtue of the design of an outer sheath (100), a multi-stage deployment assembly (200), a graft sleeve assembly (300) and a handle assembly (400), as its components, and of connections between these components. A method for using this delivery system involves, sequentially, deployment of the graft sleeve (301), initial deployment of the stent (2) and final deployment of the stent (2), accomplished respectively by the outer sheath (100), the graft sleeve assembly (300) and the multi-stage deployment assembly (200) under the control of the handle assembly (400). This method, in combination with the overall design of the delivery system, allows increased stent deployment accuracy of the delivery system and reduced possibility of medical accidents.
