Boron is an essential microelement for higher plants.Boron deficiency is widespread in several major citrus-growing countries,including Brazil and China.The advances on boron nutrition of citrus including boron concentration and distribution，boron mobility，physiological and molecular responses to boron stresses，mechanisms of differences in boron efficiency，and diagnosis of boron deficiency were reviewed.Boron efficiency of citrus scion-rootstook combinations and the criterion of leaf diagnosis in citrus was emphasized.Studies of boron nutrition in citrus concerning with the molecular mechanisms of the interaction between scion and rootstock，and the relationship between mycorrhizas and utilization of boron were prospected.