When assemble automotive steel that produced by stamping, it is widely used the resistance spot welding which is relatively easy to work with and has an outstanding bond force. Spot welding results in different features in welding zone depending on current, weld time and change of welding force, and therefore determine weld quality. If the spatter which generated in spot welding adheres to the surface of steel, it can have a bad influence on the quality of automotive exterior and needs additional work for removal. It can cause the rising of prime costs, irregular workload and the exterior with bad images. Thus, this study will examine the optimal welding condition in order to decrease the spatter through comparison of changes in the spatter according to welding current, welding force and welding time while resistance spot welding.