Abstract: Direct，rapid response of sulfamic acid and nickel can be achieved by using the suitable activator and nickel sulfaminate can be prepared with one-step method，so that it can avoid the pollution of product that synthesized by multi-step method.Effects of pre-activation time，activator，reaction temperature，pH，and reaction time on the reaction were studied.Results showed that under the conditions of 4 h activation pretreatment，using self-developed oxidative activation agent，reaction temperature of 30~50 ℃，pH of 3.0~4.0，and reaction time of 72 h，the synthesis reaction could be completed，and the hydrolysis of sulfamic acid could also be effectively controlled.The quality indexes of the obtained product met the requirements of the high-class products stipulated in the national standard of Nickel Sulfaminate for Electroplating （GB/T 23847—2009）， especially for SO42- and free ammonia contents are only 1/6 of the national standard.Now the product has been successfully put into industrialization.

Key words: nickel sulfaminate, one-step synthesis, activator