Abstract: In this article, the principle of strip electrode electroslag surfacing is introduced. Several process factors that influence weld shaping and dilution of strip electrode electroslag surfacing using ultra-low carbon Cr20Ni10 stainless steel are analysed. Research results indicate that the following process factors influence weld shaping and dilution:the welding current, voltage, surfacing speed, protroding length of strip electrode, flux thickness, control parameters of magnetic field, lap width and slope angle of plate. The dilution will decrease if the welding current and voltage increase or the surfacing speed, excitating current and slope angle of plate decrease. The experiment results also indicate that a suitable protroding length of strip electrode, flux thickness and lap width are necessary for perfect weld shaping and quality. At last the best process parameters are recommended.