The　magnetic　hysteresis　properties　of　ferromagnetic　materials　have　been　investigated　by　experimental　measurement　and　theoretical　analysis　for　mechanical　property　evaluation.　A　modified　Jiles-Atherton　(JA)　model　is　proposed　considering　both　the　frequency　and　microscopic　dependence　of　the　hysteresis　properties.　Dynamic　hysteresis　experiments　of　ferromagnetic　specimens　with　different　hardness　values　were　performed　to　measure　the　hysteresis　loops.　Microscopic　measurements　of　the　specimens　were　performed　to　obtain　the　grain　size　and　dislocation　density,　which　were　introduced　into　the　dynamic　JA　model　to　calculate　the　theoretical　hysteresis　loops.　The　genetic　algorithm　was　used　to　inverse　the　basic　parameters　of　the　JA　model　by　matching　the　theoretical　hysteresis　loops　with　the　experimentally　measured　hysteresis　loops.　Two　magnetic　parameters　(the　coercivity　and　power-law　coefficient)　were　extracted　from　the　hysteresis　loops　for　mechanical　property　evaluation　of　ferromagnetic　materials.　It　was　found　that　the　proposed　JA　model　can　be　used　for　theoretical　analysis　of　the　influence　of　the　microstructure　on　the　magnetic　hysteresis　properties,　and　the　coercivity　and　power-law　coefficient　can　be　used　for　mechanical　property　evaluation　of　ferromagnetic　specimens.　The　research　reveals　the　influence　of　microstructure　on　the　mechanical　properties　(hardness)　and　magnetic　characteristic　parameters　of　ferromagnetic　materials.