In　the　magnetic　mixing　frequency　detectionof　ferromagnetic　materials,　the　excitation　parameters　of　high　and　low　frequency　magnetic　fields　directly　relate　to　the　intensity　and　sensitivity　of　magnetic　mixing　frequency　effect.　Aiming　at　the　magnetic　mixing　frequency　detection　issue　of　the　hardness　of　ferromagnetic　materials,　the　uniform　design　method　is　used　to　study　the　influence　of　excitation　parameters　on　magnetic　mixing　frequency　effect.　Based　on　the　fuzzy　theory,　a　fuzzy　evaluation　model　of　mixing　frequency　effect　with　two　characteristic　indexes　of　variation　coefficient　and　correlation　coefficient　is　established.　On　this　basis,　the　influence　law　of　magnetic　mixing　frequency　excitation　parameters　on　the　mixing　frequency　effect　is　obtained　through　regression　analysis.The　excitation　parameter　combination　that　can　obtain　strong　magnetic　mixing　frequency　effect　is　optimized.　The　optimization　results　show　that　the　selection　of　the　mixing　frequency　excitation　parameters　has　a　great　influence　on　the　magnetic　mixing　frequency　effect.Using　the　optimized　excitation　parameters　can　obtain　stronger　mixing　frequency　effect　and　greatly　improve　the　sensitivity　of　mixing　frequency　detection.The　research　work　effectively　promotes　the　application　of　magnetic　mixing　frequency　detection　technology　in　the　field　of　nondestructive　testing.　©　2019,　Science　Press.　All　right　reserved.