In our daily lives, catalysts are used in several fields including the vehicle, petrochemical, or pharmaceutical industry. Based on nanotechnology since the middle of the last century, the efficiency of catalysts has been dramatically improved. However, the cost of catalysts is still too high due to noble metal compositions such as Pd, Pt, Ru etc. This article introduces nanoarchitectonics to design core-shell nanostructure for improving catalytic efficiency and analyze the mechanism of improvement.