合成了Ｈ３－ｘＣｓｘＰＷ（ｘ＝０～３），Ｈ４－ｘＣｓｘＳｉＷ（ｘ＝０～４）两系列杂多酸铯盐，以Ｈａｍｍｅｔ指示剂法及ＮＨ３－ＴＰＤ研究了它们的酸性质，用ＢＥＴ法测定了其表面积，并在叔丁醇脱水生成异丁烯的反应中考察了杂多酸铯盐的催化性能，其催化活性高于文献报导的其它杂多化合物在相同条件下的活性，并对该反应作了动力学分析，求得了有关参数，发现杂多酸铯盐的催化活性仅与它们的酸性质有关，与表面积无关，属于拟液相反应。 Two series of heteropoly acid cesium salts of H3-xCsxPW (x = 0 ~ 3) and H4-xCsxSiW (x = 0 ~ 4) were synthesized. Their acid properties were studied by Hammet indicator method and NH3-TPD. The catalytic activity of heteropolyacid cesium salt was investigated in the reaction of dehydration of tert-butanol to isobutylene. The catalytic activity was higher than that of other heteropoly compounds reported in the literature. Under the same conditions, Kinetic analysis was made, and the relevant parameters were obtained. It was found that the catalytic activity of heteropoly acid cesium salt is only related to their acid properties, and has nothing to do with the surface area, which belongs to the quasi-liquid phase reaction.