The invention provides an installation angle sensing system for artificial hip joint replacement and a method thereof, which mainly installs a positioning auxiliary device on a back of a human body and generates a reference reference coordinate value, and then mounts the positioning measuring device on the artificial hip joint And installing one end of the artificial hip joint acetabular cup at the acetabular fossa of the human body, further generating a rotational coordinate value through the positioning measuring device, and transmitting the rotational coordinate value to the positioning auxiliary device to calculate the rotation relative to the reference reference coordinate value The coordinate value produces the position information of the artificial hip joint to install the acetabular cup by the position information. In this way, a non-invasive and easy-to-install installation angle sensing system and method can be effectively improved to replace the traditional artificial hip joint replacement method.本發明係提供一種人工髖關節置換之安裝角度感測系統及其方法,其主要將定位輔助裝置安裝於人體背部後且產生參考基準座標值,其後再將定位量測裝置安裝於人工髖關節且將人工髖關節之髖臼杯的一端安裝於人體髖臼窩處,進一步透過定位量測裝置產生轉動座標值,且將轉動座標值傳送至定位輔助裝置以計算相對於參考基準座標值之轉動座標值而產生人工髖關節的位置資訊,以藉由位置資訊進行髖臼杯的安裝。如此以提供非侵入性且操作簡易的安裝角度感測系統及方法,即可有效改善傳統憑經驗進行人工髖關節的置換方式。