In　recent　years,　the　safety　of　cables　of　cable-stayed　bridges　has　attracted　extensive　attention,　and　the　rise　of　radar　technology　has　provided　new　possibilities　for　the　performance　testing　of　cable-stayed　bridges.　In　this　regard,　this　paper　introduces　the　principle　of　microwave　radar　measurement　technology　and　uses　the　microwave　cable　force　measuring　instrument　to　perform　noncontact　microwave　radar　cable　force　measurement　on　a　total　of　72　stay　cables　in　Shifeng　Bridge　and　San-Jiadian　Bridge　compared　with　the　measurement　results　of　the　cloud　smart　collector.　The　results　show　that　the　fundamental　frequency　deviation　rate　of　71　cables　is　within　3%,　and　the　cable　force　deviation　rate　of　67　cables　is　within　5%.　This　shows　that　the　microwave　radar　cable　force　measurement　method　has　a　high　degree　of　reliability　and　accuracy;　meanwhile,　it　is　also　found　that　the　forces　on　the　left　and　right　sides　of　the　two　bridges　are　in　a　symmetrical　state,　and　the　structure　is　in　good　condition;　the　signal　characteristics　are　obvious,　and　the　simultaneous　measurement　of　multiple　cables　can　be　realized,　and　it　is　not　limited　by　weather,　site,　and　the　length　of　the　stay　cable　and　has　strong　practical　value.