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Ring mold is a core but easily blocked component in feed processing machinery.The Common cleaning methods are manually holes by holes both in China and abroad.For those bottlenecks just like low cleaning efficiency,vulnerable to misoperation by carelessness and damage the ring mold,an effective method was proposed to locate the die of ring mold. First,the feasibility towards the location the die of ring mold was studied based on MFL by magnetic sensitive element.Then,a detection probe was made on the basis of the relationship between electromagnetic shielding and shielding materials. Finally,according to the captured signal characteristics of die hole,a ring die bore localization algorithm mode was built to analyze the effectiveness of the die hole positioning program based on the design ideas of efficient Golden search optimization. The results showed that the positioning accuracy of system developed was below the rank of mm. The scratch rate of die hole was greatly reduced. And thus the service life of ring mold was extended.