There were great difference between actual results of Shijiazhuang deep foundation pres-tressed anchor and theoretical calculations results, the retaining structure monitoring results an under-ground garage pile-anchor were analyzed.Montitoring results show that the loss prestressed bolt loc-king force is great by using of Native craft methods; the locked stable rally general is only 100kN, which is 1/2 to 1/3 of the original design value.The growth of rally is not obvious according to thelong-term observation results.This paper greatly reduces the loss of the locking force through the ap-propriate technology and construction tools.