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 the raw material and (NH₄)₂HPO₄ as the activator, N source and P source. Then, we 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 via one step method. The results showed that when the pyrolysis temperature was 900 ℃ and the mass ratio (NH₄)₂HPO₄ : CAs was 1∶2, the sample 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 dopants were successfully achieved. The mass fractions of N and P reached 0.54% and 0.13%, respectively. The hydrophilicity was greatly improved. In the three-electrode system, it exhibited a high specific capacitance of 150 F/g at a current density of 1.0 A/g. It also remained a quite high cycle life.