The catalytic performance of SAPO-11 exhibited excellent. When modified with Mn2+ or Zn2+, the catalytic activity decreased according to the lower ethylene selectivity (76.7% and 69.9%) and ethanol conversion (92.2% and 86.9%) and the higher diethyl-ether selectivity (15.1% and 16.9%). This result showed that the incorporation of Mn2+ or Zn2+ into SAPO-11 surface was unfavorable to catalytic activity. In contrast, Mn2+ or Zn2+ modified SAPO-34 presented noticeable better catalytic activity than SAPO-34. Moreover, SAPO modified with Mn2+ showed higher efficiency than modified with Zn2+. In summary, conversion of ethanol and selectivity of ethylene decreased in the following order