Sintered stainless steel fiber felt (SSSFF) is a kind of porous material promising for functional and structural applications such as energy absorption and solid/gas filtration etc. In this work microwave heating was used for sintering of 316L stainless steel fiber felt and the effect of microwave heating on the sintering profile ，microstructure and mechanics performance of the sintered stainless steel fiber felt was investigated by means of μ-CT，SEM and so on. The experiment result showed that in contrast with conventional sintering method, microwave heating can sinter stainless steel fiber felt at lower temperature within shorter time, and the higher mechanic performance of SSSFF can be achieved by this means. The microwave field induced arcing between metal fibers may accelerate the sintering process.