The stable, easy recoverable heterogeneous catalyst Ir-N@C ( 5 wt % Ir content) is obtained by impregnation with commercial carbon powder. The factors for the N-alkylation reaction including different iridium catalysts, reaction temperature, reaction time, bases are investigated. Experiment results suggested that the N-alkylation of amines with primary alcohols could be efficiently catalyzed in water using iridium catalyst with n (Ir) : n (1,10-Phenanthroline) = 1 : 2. In recycling experiment, the catalyst shows good stability and the catalytic activity is not obviously decreased. The catalyst is characterized by XRD, TEM, XPS, BET.