以偏高岭土兼作Al、Si源，H₃PO₄作磷源，十六烷基三甲基溴化铵－三乙醇胺为复合模板剂，采用分段晶化的方法制备磷酸硅铝分子筛。利用X射线衍射分析、扫描电镜、XPS及NH₃-TPD等手段对产物进行了表征。实验结果表明：产物为柱状的磷酸硅铝分子筛，其晶粒尺寸大约为20 μm×5 μm×5 μm，其晶体结构中P:Al:Si＝1:1.19:0.67（摩尔比），硅含量较高；采用分段晶化方式制备的SAPO-5分子筛的总酸量为578.0 μmol/g高于一段晶化方式制备的SAPO-5分子筛的总酸量；采用分段晶化生成的SAPO-5分子筛的催化正丁烷异构化反应初始活性可达到24.8 %，远高于一段晶化制备的SAPO-5分子筛的初始活性14.1 %。

Silicoaluminophosphate（SAPO-5） molecular sieves were synthesized respectively by the piecewise and one-step crystalline methods,with metakaolin as the silicon and aluminum sources,phosphoric acid as the phosphorus source and with triethylamine combined with hexadecyl trimethyl ammonium bromide as the template agent.Then,the prepared molecular sieves were characterized by means of XRD,SEM,XPS and NH₃-TPD analysis.The results show that the product prepared by the piecewise crystalline method is of uniform pillar-like morphology,large size（about 20μm×5μm×5μm）,proper P∶Al∶Si molar ratio（1∶1.19∶0.67）,high Si content and higher total acid content（578.0μmol/g）,and that its initial activity（24.8%） is much higher than that of the product prepared by the one-step method（14.1%）.