The formation of ammonium sulfates and existence of mass transportation limits during selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) are severely affecting the de NO x performance of small pore zeolites. Herein, a novel hierarchical porous Cu-SAPO-34-Meso zeolite rich with mesopores was synthesized by one pot dual-template strategy. Cu-SAPO-34-Meso exhibited remarkable de NO x performance and broaden temperature window compared with Cu-SAPO-34-Con without mesopores, especially at low reaction temperature, which should be attributed to the mesopores in Cu-SAPO-34-Meso can accelerate the transportation of the reactants and this has been confirmed by the diffusion calculation. Even exposed on SO 2 feed gas, Cu-SAPO-34-Meso also displayed better SO 2 resistance compared with Cu-SAPO-34-Con. The in situ DRIFTS revealed that the enhanced SO 2 tolerance might be attributed to Cu-SAPO-34-Meso with mesopores could prevent the sulfur species blocking the pores and promote the decomposition of the sulfur species quickly. Therefore, the novel Cu-SAPO-34-Meso catalyst might be a good candidate for real diesel emission control application. • Mesoporous Cu-SAPO-34 with high crystallinity was synthesized. • Cu-SAPO-34-Meso exhibited enhanced NO x removal performance. • Cu-SAPO-34-Meso rich with mesopores can facilitate the mass transportation of the reactants. • Cu-SAPO-34-Meso rich with mesopores displays enhanced SO 2 resistance. • Cu-SAPO-34-Meso exhibit good high and low temperature hydrothermal stability.