Abstract: Welading is the main technology for the processing of prestressed concrete cylinder pipe (PCCP) steel cylinder, welding process control parameters directly affect the quality of weld seams, which in turn affects the performance of PCCP applications. It is particularly important to determine the optimal welding process parameters of PCCP steel cylinder, and the spiral welding process is comprehensively optimized based on the method based on field data acquisition and improved MULTIMOORA method, based on weld characteristic index. Firstly, the data of each index is obtained and sorted, the indicators are converted into multi-attribute decision-making problems, through the evaluation of the index data, the weight factor is defined to allocate the priority, the index is quantified, the scheme is sorted according to the optimization principle, the process adopts the OWA operator and entropy weight method to eliminate the extreme value influence of the subjective evaluation value, the index comprehensive weight is obtained, the decision ranking is optimized, and finally the technical parameters of the welding control process are finally evaluated by using the dominant theory. The results show that the optimal welding parameters of PCCP steel tube are welding current 340 A, arc voltage 24 V and welding speed 10.81 mm/s, which can provide technical reference for PCCP steel tube welding process.