Dalian fast and slow wire cutting process said that under the condition of fully ensuring the tensile strength data of molybdenum wire, at the same time, the elongation of molybdenum wire is small, molybdenum wire does not stretch on the use site, and the wire breaking probability is small. Within a certain processing area, the wire diameter change value is within 0.005, while in the medium wire cutting and trimming process for many times, the wire diameter change value of molybdenum wire is zero in the practice of precision trimming power supply.