The　accurate　model　of　the　load　state　for　all　balls　under　multidirectional　load　is　very　helpful　for　the　design　process　of　ball　screws.　The　contact　deformation　model　of　the　ball　screw　without　consideration　of　the　stress　difference　of　all　balls　is　inaccurate.　In　this　paper,　a　novel　contact　load　model　of　the　ball　screw　is　established　by　considering　coupled　axial,　radial　load　to　study　the　elastic　deformation　displacement　and　position　accuracy.　The　deviation　and　variation　of　axial　elastic　deformation　with　the　dimension　errors　of　all　balls　are　investigated　to　obtain　the　influence　of　load　state　on　the　precision　sustainability　of　the　ball　screw.　The　position　precision　including　travel　deviation　and　variation　by　considering　load　distribution　of　all　balls　is　studied　under　the　different　load　conditions.　In　addition,　a　new　working　bench　is　designed　to　study　the　position　precision　of　the　ball　screw.　The　experimental　study　is　carried　out　to　obtain　the　relationship　between　the　position　precision　and　the　contact　load　state　of　all　balls,　which　is　a　reference　to　compensate　for　the　precision　loss　of　the　ball　screw.