The shape and color spots of the slender snake are very similar to those of the Hainan slender snake. The head and eyes are small, and the scales are full of luster. Under the sunlight, they can shine. Electric blue, sapphire green, blood red, purplish red and copper-colored luster, from which the name of the flash-scale snake comes.

The total length of the scorpion is about 1 meter, and the tail is short, which is only about 1/12 of the total length of the body. The abdominal scales are narrow. The bottom row of dorsal scales is gray-white, the ventral surface is gray-white, and the lower tail scales at the rear of the tail are blue-brown. The back of the head is blue-brown, and the head and belly are light blue-gray or light brown. The head is small and slightly flat, and the snout is round and pure, and its width is less than 3 times that of the adjacent dorsal scales, which is the original feature of the flash-scale snake.