Granitoids in the Eastern Guangdong encompass three main rock types: Dapu biotite granites,Dapu bitite K spar granites and Jiexi bitite K spar granites. Zircon LA ICP MS U Pb dating of Dapu biotite granites and Jiexi bitite K spar granites indicates similar ages of emplacement of 136.3±0.6Ma and 134.9±0.4Ma ,respectively, which belongs to Early Cretaceous but not Late Jurassic; All of these three types of rocks are rich in Si,Al, medium in alkali content, but poor in Fe, Mg, Ca,Ti and P, belong to a high K calc alkaline series, as well as a weakly peraluminous granite series. Dapu biotite granites hasδEu mid negative anomaly, slightly right inclined REE distribution pattern, forming by the partial melting of Proterozoic arenitic metasediments. Dapu bitite K spar granites and Jiexi bitite K spar granites have strongly δEu negative anomaly, seagull like REE pattern. Dapu bitite K spar granites and Jiexi bitite K spar granites are coexist closely, forming in the same time,and shows continuous variation trend in geochemistry, have similar isotopic composition, may be formed by partial melting of Proterozoic pelitic metamorphic sedimentary rocks, are the results of different evolution stage of the same magma.