Abstract: The method of wire arc additive manufacturing was used to obtain the in-situ cladding layer on the surface of 304 stainless steel substrate. The influences of heat input,arc length and wire-filling angle on the geometry parameters of cladding layer were systematically studied.The results showed that the depth of fusion,weld width and reinforcement increased with increase of the heat input. When the length of arc increases,both the weld width and reinforcement increase,but the depth of fusion changes slightly. Moreover,the weld width increases with the increase of wire-filling angle. Meanwhile,the depth of fusion and reinforcement do not change significantly. Finally,the analysis of microstructure showed that there are mainly dendrite grain in the lower,middle and upper part of the cladding.