An improved structure of a four legged crutch.It mainly includes an ontology.There are two opposite supporting frames.And a plurality of cross bars connecting the support frame；An induction unit,Attached to the body,At least one inductor is electrically connected with a control circuit and a light-emitting element.When the sensor receives a signal and transmits it to the control circuit,The control circuit sends a command signal to the light-emitting element；One warning unit,The warning unit has a wearable element.The load-carrying element is provided with a sensing piece electrically connected with an alarm.When the sensor disengages from the alarm,The siren makes a sound.To produce warning effect；With the above elements,Provide users with better safety effect.一種四腳拐改良結構，主要包含有一本體，具有兩兩相對稱之支撐架，及連接該支撐架之若干個橫桿；一感應單元，係設於該本體上，具有至少一感應器電性連接一控制電路及一發光元件，當感應器接收到一訊號並傳送到該控制電路，該控制電路即發送一命令訊號給該發光元件；一警示單元，該警示單元具有一穿戴元件，該穿載元件設有一感測件電性連接一警報器，當該感測件脫離該警報器，警報器便發出聲響，藉以產生警示效果；藉由上述元件，提供使用者更良好的安全效果。
