The efficiency of high strength steel welding process evaluation is focused. By establishing knowledge library using welding experience, ship classification rules and database operation environment, a digitized welding process evaluation system is established. The involved welding experience are carbon equivalent, cold cracking sensitivity index and process weldability. The applicability of various carbon equivalent formulas to predicting the preheated temperature are discussed. After the selection of carbon equivalent knowledge experience, the prediction program for primary welding parameters are developed. The in-operation system simplifies the welding process evaluation, indicating its digitalization are efficient in welding parameters prediction.