The invention discloses an N-arylating method in the solution, which is characterized by the following: adopting aryl halogenated and amine or nitrogenous heterocyclic aromatic compound as raw material; using water as solvent; heating under indoor temperature or traditional heating or auxiliary microwave heating; making alkaline metal or carbonate of alkaline metal, fluoride, phosphate or hydroxide as alkaline; adding surface activator; forming ternary catalytic system (copper catalyst, oxalyl hydrazine and ketone) to catalyze C-N coupling reaction.