Abstract: Anchor load observational data indicate that the actual load of anchor cable is generally much lower than its rating working load. It is found by experiments of ultimate pullout forces of anchor cable that anchoring agent has not been thoroughly whipped by the normal steel strands, the two ingredients in the resin anchoring agent can not be fully mixed which failed to its hardening, and it is supposed to be the main reason of the low anchoring force. The use of blade stirring stirring anchor can greatly improve the performance of anchor, which makes stir anchoring agent and uniformly mixed and improves the anchor anchor force.