Based on the complexity of fabricating the taper fiber and the performance in transmission of the image bundles,through applying the technology of combining step motor and computer,controlling the usual optical fiber double crucibles drawbench out-nozzle diameter and tub wheel′s rotating speed at the same time,of a way fabricating the taper fiber with numerical control,whose length can reach to 1m,is realized.Two image taper fiber bundles with the different ratio of radius are made.Compared with the ususl way that enlarging the volume of the tub wheel,this technique is smaller in the volume,easier to manipulate,easier to control the ratio of radius,more endurable to strain.At last we analyses the mode wastage of the taper fiber.