The effects of high boron stress on the absorption and distribution of traceelements(B，Mn，Fe，Cu，Zn，Mo)in young plants of Newhall navel orange wererevealed，in order to provide a theoretical basis for the nutritional physiologyof boron fertilizer and the scientific application of trace elements in production.In thisexperiment，young plants of Newhallnavel orange were used as test materials，and the young plants were treated with high boron treatment(B:200 μmol/L)and moderate borontreatment(B:20 μmol/L，control)by nutrient solution culturemethod.The young plants of Newhallnavel orange were divided intoroots，stem ofrootstocks，upper stem ofscions，lower stem ofscion，upper leaves and lowerleaves.The concentrations of trace elements were determined，and the accumulation and distribution of elements in eachpart werecalculated.Under the high boronstress，the dry weight of roots of young plants of Newhall navel orange decreasedsignificantly，and the dry weight of other parts did not changesignificantly，and the concentration and accumulation of B inall parts increasedsignificantly，and the distribution rate of B in leaves increasedsignificantly.Mn，Fe，Zn and Mo weremainly enriched in the roots.The high boron stress reduced the Mn concentration in each part significantly，and the Feconcentration and accumulation in the roots were also decreased significantly，but the distribution rate ofMn，Cu and Mo ineach part were not obviouslychanged.The change of high boron stress significantly reduced the concentration of Cu in thelowerleaves，and also decreased the concentration and accumulation of Zn in the upperstems，and the Mo concentration inroots and rootstocks increasedsignificantly.