The grass snake is about 1.5 meters long. The back is gray-brown to brown, with many black-brown horizontal spots arranged at about equal intervals, and there are two light-colored vertical stripes on the back. The ventral surface is yellowish-white, and there are often small black spots on both sides of the abdominal scales, dotted before and after, the head is brown or bronze, and the throat is yellow. Dorsal scales ribbed.

There are two common versions of the color body characteristics of grass and flowers, namely maroon, brown The green and black patterns and the brown, green and light black patterns are usually easily confused with the black-browed brocade snake and the tiger-spotted swimming snake, which look like the illegitimate children of the two snakes.