The selective laser melting（SLM）experiments were conducted with Ni-Fe metal powder.Influences of different process parameters such as laser intensity

pulsed width

scanning velocity

laser frequency

spraying thickness and scanning spacing

have been investigated by the single-layer singlechannel scanning and single-layer multi-channel scanning experiments.Based on above results

optimized parameters have been adopted for multi-level multi-channel scanning process.By observing the block features

the influence of parameters on surface quality has been analyzed

and optimal process parameters were obtained for nickel-Fe metal powder.