Abstract: Aiming at the bonding problem between Babbitt alloy and steel matrix of heavy duty oil film bearing bush, the influence of different heat input parameters on the bonding performance between SnSb8Cu4 and 20 steel under submerged arc welding process was studied, and it was compared with the traditional centrifugal casting process.The results show that SnSb8Cu4 and 20 steel achieve good metallurgical bonding under submerged arc welding process.The microstructure of Babbitt alloy after welding is fine, uniform, compact and no segregation.The bonding strength under the heat input of 2300-17000 J/mm is about 100 MPa, which is about 80% higher than that of centrifugal casting and 25% higher than that of MIG welding.The surface hardness of Babbitt alloy by submerged arc welding is about 25HV, while that by centrifugal casting is lower than 20HV.The fracture surface of submerged arc welding specimens occurs in Babbitt layer, which is quasi cleavage fracture due to insufficient Babbitt alloy strength.And the fracture surface of centrifugal casting specimen occurs in interface layer, which is peeling off due to insufficient interfacial bonding strength.The change of heat input of submerged arc welding will affect the bonding strength between SnSb8Cu4 and 20 steel, the element distribution, the degree of grain refinement and hardness of Babbitt alloy.