The whole body of the cunbai snake is arranged with white and black rings on the back. The white ring is narrow, the tail is slender, and the body length is 1000-1800mm. The back of the cunbai snake is black or blue-black, with 30-50 white or milky Yellow narrow stripes, ventral surface dirty white.

The head and back of the inch white snake are dark brown, and the larvae have Has a light inverted V shaped spot. The dorsal ridge is high, triangular in cross-section, and the end of the tail is pointed. The head is oval in shape, indistinguishable from the neck, with typical 9 large scales on the dorsum, no cheek scales, a row of ridge scales in the middle of the back that expands into a hexagonal shape, and a single row of lower caudal scales.