Endovascular　stents　are　used　to　dilate　vascular　stenosis　so　as　to　restore　blood　flow.　However,　what　kind　of　stenotic　blood　vessels　need　stent　treatment?　It’s　a　biomechanical　problem.　In　this　paper,　the　logical　relationship　between　vascular　stenosis,　myocardial　ischemia　and　stent　treatment　was　analyzed　from　the　functional　evaluation　index　of　vascular　stenosis,　and　the　biomechanical　mechanism　of　coronary　stent　intervention　was　illustrated　with　a　vivid　metaphor　of　farmland　irrigation,　so　as　to　inspire　readers　to　think　about　the　basic　engineering　science　principle　behind　clinical　medicine.　©　2024　Chinese　Academy　of　Mechanics.　All　rights　reserved.