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报道了α-Keggin型(NH4)4HPW10V2O40·2．5H2O的水热合成方法，采用X-ray单晶衍射测定了晶体结构．结构分析表明：该晶体属于三斜晶系，空间群为P1，晶胞参数：a=1．322 3(3)nm，b=1．324 3(3)nm，c=1．325 3(3)nm，α=75．98(3)°，β=75．99(3)°，γ=76．06(3)°，Z=2，R1(wR2)=0．081 2(0．198 0)．杂多酸阴离子作为一个整体是有序α-Keggin结构，但由于异构体存在，钨和钒原子在晶体学上无序分布在12个配原子位置上，钒在每个配原子位置上占有率并不相等，平均值为0．167，总占有率为2．00．元素分析、热重分析、UV、IR、31p NMR光谱支持单晶X-ray衍射结果．“,”It has been reported that the title compound was synthesized by a hydrothermalmethod and structurally characterized by single crystal x - ray diffraction. The crystal datawere shown below: triclinic, space groupP1,α=1.322 3(3)nm, b = 1. 324 3(3)nm, c =1.325 3(3)nm, α=75.98(3)°,β= 75.99(3)°, γ= 76.06(3)°,Z= 2, R1(wR2) =0. 081 2(0. 1980). Although the heteropolyanion is ordered a - Keggin structure, W and Vatoms are disorderly distributed in 12 addenda atoms crystallographically. The occupationprobability of V on each addenda atom is unequal, the mean value is 0. 167 and the totalprobability on anion is 2.00. The result was supported by elemental analysis, therrogravimetric analysis, UV- Vis, IR,31P NMR spectra.