Abstract: In order to explore a multi-functional activator for carbon aerogel to improve its electrochemical performance, we used resorcinol-formaldehyde based carbon aerogel as raw material and (NH₄)₂HPO₄ as activator and N source and P source, and then prepared N/P co-doped activated carbon aerogels(NP-CAs) via solid phase physical grinding and mixing. The activation and diatomic doping of carbon aerogels were completed by one step method. The results showed that when the pyrolysis temperature was 900 ° C and the mixture ratio (NH₄)₂HPO₄ : CAs was 1∶2, it had a specific surface area of 1196.75 m²/g and a total pore volume of 1.60 cm³/g. The doping and uniform distribution of N/P diatoms are achieved successfully. The mass fraction of N and P reached 0.54% and 0.13%, respectively. The hydrophilicity is greatly improved. In the three-electrode system, it exhibited a high specific capacitance of 150 F/g, at a current density of 1 A/g. It also remained quite high cycle life.