Abstract: Pre-stress plays an important role on anchored cable supporting,but in engineering practice,there was pre-stress loss.Prestress loss test was done in Zhangcun Colliery,the conclusion that anchored cable length,diameter,tension degree,tension device,anchored device and coal and rock property influenced pre-stress loss.Dissolving method was put forward,that is,anchored cable was supernormally tensioned to 25%,and pre-stress could meet design requirement.