The mouse snake is one of the non-venomous snakes unique to China. It is called differently in different regions. It is also the largest type of non-venomous snakes. The adult mouse snake can reach 1.5m in length, and some even exceed 2m.

The back of the mouse snake is yellowish brown, and the back of the body is irregular Black horizontal stripes, horizontal spots to the tail to form a reticulate, reddish-brown in the front part of the abdomen, light yellow in the rear. The head is dark brown, the lip scales are light gray, the ventral surface is yellow-white, the posterior margin of the ventral scales is black, and the ventral scales on the front, rear and tail of the body are black, and the posterior margin is more obvious. The cheek scales are generally 3 pieces, the dorsal scales are generally 19-17-14 rows, and the abdominal scales are more than 185. The head is long, the eyes are large and round, the pupil is round, the narrow part is slightly concave, the narrow scale is generally 3, the hemipenis is not forked and cylindrical. Cheek scales 3 or 4, eyes 2 or 5 less, easy to distinguish from other snakes. There are 19 rows of dorsal scales on the neck, 17 rows in the middle of the body, 14 rows in the front of the anus, 189 to 193 rows of ventral scales, and 100 to 118 pairs of lower caudal scales. The back is yellowish-brown, with black reticulate or horizontal stripes behind the body, the ventral surface is yellowish-white, the posterior edge of the ventral scale and the lower tail scale is black, sometimes yellowish-white.