用水热晶化法合成了ＡｌＰＯ４－５和ＳＡＰＯ－５分子筛，借助ＸＲＤ、ＩＲ、吸附吡啶的ＩＲ及ＮＨ３－ＴＰＤ等手段对其进行了表征，并通过间二甲苯异构化反应对其催化性能进行了评价．将其催化性能与表征结果相关联得出：Ｂ酸中心是间二甲苯异构化的活性中心，ＳＡＰＯ－５的Ｂ酸中心多，其间二甲苯异构化的活性（４５．８％）和选择性（６３．２４％）也高．异构化的选择性还与Ｂ酸中心的强度有关． AlPO4-5 and SAPO-5 zeolites were synthesized by thermal hydrothermal method and characterized by XRD, IR, IR and NH3-TPD adsorption of pyridine, and their catalytic properties were also studied by isomerization of m-xylene did an evaluation. Correlation between the catalytic properties and the characterization results showed that the acid sites of B were the active centers of m-xylene isomerization, the acid sites of SAPO-5 were more, the isomerization activity of xylene (45.8%) and Selectivity (63.24%) is also high. Isomerization selectivity is also related to the strength of the B acid center.