To investigate NOx thermal storage and NOx storage/reduction (NSR) performance with H2 as reductant, perovskite catalysts were studied by using the temperature-programmed desorption and temperature-programmed surface recation method. Storage experiments and storage-reduction experiments were conducted on a simulation bench, which provided some insight into the influence of reaction temperature, reduction time, and using H2 as reductant. The result indicated that LaCoO3/K2CO3/CeZrO2 perovskite catalyst processed good NOx storage and reduction property. A NOx conversion ratio of 60% to 80% can be achieved between 350 ℃ and 400 ℃, which could help to reduce NOx in high condition.