This article deals with the occurrence, mineral assemblages, physical and chemical properties of magnetite in eastern Guangdong. The study shows that different occurrences and assemblages of magnetite correspond to different geneses. Mineralogical evidences suggest that the physical properties of magne- tite are related with the FeO, MgO, Mn0 contents, i. e.，along with the in- crease of the contents of these constituents there are decreases of gravity (5 .17 →4.79)，indentation hardness (725→551Kg/mm2) and increase in unit cell cons- tants(8.392→8.477A)of the magnetites. The variations of those properties of magnetite are closely connected with their geneses. In paragenesis of minor elements of magnetite, there are high percentages of Ti, Cr, Ni, Co and V, Ti: V=10:1, Co:Ni=1:1 in magnetite from post}magmatic differentiation iron depositsf high percentages of Mn, Mg, Zn and Sn, Ti: V=50:1, Co:Ni=2:1-3:1 in magnetite from contact-metasomatic iron deposits; high in Ge content, Ti:V =20:1,Co:Ni=3:1 in magnetite of volcano-sedimentary iron deposits; and great amount of Mn, Mg, Sn and Ge, Ti:V=26:1，Co:Ni=1:6 in magnetite from metamorphic iron deposits. Typochemical characteristic. of magnetite of diffe- rent geneses are quite clear.