The issue of whether steel strand slippage occurs in the anchorage of the whole bundle of steel strand extrusion cables under long-term load is a highly concerned issue. This study (project) conducted simulation experiments for this purpose. Firstly, a groove was made on the anchorage device of a single steel strand extrusion cable to release the extrusion stress. Static load tests showed that there was no steel wire slipping; Then, a static load test was conducted on the 19 hole steel strand after high-temperature stress annealing, and the steel strand broke in the free section instead of slipping off at the anchorage. The experiment has proven that the anti slip performance of the extruded cable anchor is relatively reliable