Abstract: The effects of process parameters (rotation speed, force and traverse speed) on friction surfacing layer were investigated. The results show that width and thickness of surfacing layer decrease linearly with increasing consumable-rod rotation speed and width increases and its thickness decreases with increasing force. On the basis of heat source model, the functional relationship between match factor of process parameters (product of rotation speed and force) and preheating time was established. The match factor of process parameters could be determined according to preheating time, then three process parameters could be decided according to their effects on surfacing layer properties, and the process parameters were optimized.