To avoid the forming of cracks in iron based laser cladding, the volume fractions of austenite and cemetite in cladding layers were adjusted through adjusting the contents of Ni. The claddings were produced on gray irons without preheating. Based on the optimum parameters of laser processing, the effects of Ni contents on the volume fraction of austenite and surface cracking were investigated, the cracking mechanisms were revealed, and a sort of Fe C Si Ni cladding material was obtained which could form crack free 25 pass cladding layers on iron. By adding Ti powders into the Fe C Si Ni cladding material, endogenous TiC could form in cladding layers. The effects of endogenous TiC on wear resistance of cladding layers were also investigated. As a result, Fe C Si Ni Ti cladding materials were obtained which could improve the cracking and wear resistance significantly.