The brown-backed rat flat can grow to 80-130 mm, and the body size is relatively large. The flat back of the brown-backed rat has reddish-brown hair, gray-black base, reddish-brown hair tip, mixed with a small amount of all-black hair, and gray-white hair on both sides of the body and abdomen. The tail hair is short, gray-black above and gray-brown below.

The skull of the brown-backed rat flat is thick and short, with a The concave longitudinal groove, up to the rear end of the frontal bone, is still under stuffing. The skull is longer. Not much to hear. The cheekbones are slightly thicker.