Tb1-xDyxFe2　system　has　attracted　more　research　interest　due　to　the　large　magnetostrictive　effect.　The　crystal　structures　and　physical　properties　have　been　well　studied,　but　research　studies　on　their　local　structures　are　still　rare.　In　this　work,　the　local　structure　of　Tb1-xDyxFe2　samples　was　studied　using　the　pair　distribution　function　and　x-ray　absorption　spectroscopy　techniques.　The　results　demonstrate　that　the　system　owns　the　same　local　crystal　symmetry　with　its　average　structure　in　the　ferromagnetic　phase,　and　the　crystal　lattice　of　the　system　is　more　ordered　with　increasing　Dy　content,　indicating　that　the　Dy-rich　tetragonal　phase　is　more　stable　than　the　Tb-rich　rhombohedral　phase.　The　different　roles　of　metallic　bonds　in　affecting　the　crystal　lattice　are　presented.　The　weak　Fe1-Fe2　bonds　influenced　by　the　local　environment　such　as　local　stress　from　randomly　distributed　nanodomains　could　originate　the　anomalies　in　the　lattice,　resulting　in　the　more　ordered　and　stable　Dy-rich　phase　than　the　Tb-rich　phase.　©　2020　Author(s).