A ligament laxity measuring system for measuring ligament laxity between a first limb and a second limb includes a force module, an angle sensor module and a computing module. The force module includes a force sensor. The force module disposes on the first limb. Apply force on the force module, so as to let the first limb pivot or torque with respect to the second limb and gain a pivot value or a torsion value. The force sensor generates a force signal according to the applied force. The opposite two end of the angle sensor module dispose on the first limb and the second limb respectively. The angle sensor module generates an angle signal according the pivot value or the torsion value of the first limb. The computing module computes the force-angle corresponding value according the force signal and the angle signal.一種韌帶鬆弛度量測系統,用以量測第一肢體及第二肢體間之韌帶鬆弛度,其包含一力量模組、一角度感測模組及一運算模組。力量模組包含一力量感測器。力量模組設於第一肢體,並供外力施加而令第一肢體相對第二肢體樞轉或扭轉而產生一樞轉量或一扭轉量,且力量感測器依據外力而產生一力量感測訊號。角度感測模組相對兩端分別設於第一肢體及第二肢體。角度感測模組感測第一肢體之樞轉量或扭轉量而產生一角度感測訊號。運算模組依據力量感測訊號及角度感測訊號計算出一力量角度關係值,以作為判斷韌帶鬆弛度之依據。10‧‧‧韌帶鬆弛度量測系統20‧‧‧第一肢體30‧‧‧第二肢體100‧‧‧力量模組200‧‧‧角度感測模組300‧‧‧運算模組400‧‧‧資料擷取模組500‧‧‧固定模組