As a microporous zeolite, SAPO - 11 zeolites usually have a large particle size, but how to further synthesize hierarchicalnano-SAPO-11 zeolites on the basis of hydrothermal method is a great challenge. Based on the hydrothermal method,SAPO-11 zeoliteswere prepared by aging treatment with the precursor gel. Among them,the SAPO-11 zeolites prepared by stirring aging treatment at 80 ℃has the smallest crystal size. It can be seen by SEM that the S11-80 ℃ -stirring zeolite show a uniform nanorod-like structure,these nanorods have a diameter of about 500-700 nm and a length of about 2-4 μm. 2-Methylnaphthalene (2-MN),which is mainly derivedfrom coal tar,can be used to prepare 2,6-dimethylnaphthalene (2,6-DMN),and then be used to synthesize high-end polyester. Therefore,the above-mentioned hierarchical nano-SAPO-11 zeolites were applied to catalyze the alkylation reaction of 2-methylnaphthalene.The results show that the SAPO-11 zeolites prepared by aging treatment have 77.8% initial conversion of 2-MN,20.4% initial selectivity,1.13 ratio of 2,6- DMN / 2,7-DMN,and the highest selectivity of 2,6-DMN of 39.9% at the 4th hour of reaction. The shape selection catalytic mechanism of SAPO-11 molecular sieve was revealed by series characterization.