There were many rift structures on NEB in the apparition of 2000-2001. I generated 24 strip maps and measured the longitudes of white spots and rifts on NEB from CCD images. A small white spot occurs in the center of NEB, and it grows toward the east and west by the sheared jetstream and toward the north and south at the same time. Finally it grows to the rift of NEB. Because the rift is supplied from the new white spot, it is extended more toward the east and west. The rift grows up to 15-30 days, and disappears gradually after it has 110 degrees length of longitude. The white spots occur one after another in the same location of NEB, then its generate a new rift. These sources are identified to eight locations, and these have 9h54m15s of the averaged rotation period. Also, these sources themselves live until 3 to 5 months.