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Two triangular pyramidal {AsO2(OH)} bridging erbium and ytterbium incorporated arsenotungstates [H2N(CH3)2]8Na8{[W3RE2(H2O)8AsO8(OH)][B-α-AsW9O33]2}2·65H2O [RE = Er(1)and Yb(2)] were synthesized by reaction of Na2WO4·2H2O,RE(NO3)3·6H2O and NaAsO2 in the presence of dimethylamine hydrochloride and were structurally characterized by IR spectra,UV spectra,elemental analyses and single-crystal X-ray diffraction.