The head and body length of all adult sand lizards are 50-60mm, and most of their backs are yellowish brown or grayish brown with dark markings, except sand lizards with big ears. However, the trunk of grass lizard is 6cm long, the tail length can reach 2~3 times of the trunk length, the back is mainly brown, and the scales have obvious protrusions. Sand lizard is a new genus established by Kaup in 1825. Type species is Phrynocephalusgut—tatus, a Palaearctic group of Iguanidae, and also a common dominant lizard species in deserts and grasslands of Eurasia. The taxonomic study of the sand lizard began in the19th century and flourished in the early 20th century. It was marked by Bedriaga's detailed description of the sand lizard species and the key table compiled in the book "The Third Scientific Exploration of Central Asia in Phuket" (1907- 1909), and it is still considered as a classic work of the sand lizard. The sand lizard recorded in the book is Grass lizard, lizard family 1 genus, feeds on insects, with a slender body, about 50 ~ 60 mm, and a slender tail, which is more than twice as long. There are symmetrical scales on the top of the head, and the ridge scales on the back are arranged vertically. When the abdominal scales are near the square, the tail is easy to cut by itself and regenerate after cutting.