Microstructure and ultrastructure of the tongue in Takydromus sylvaticus was observed. The ventral mucosa is smooth,while the dorsal mucosa is rough,with filiform papilla and circumvallate papilla. The filiform papilla is large and cone-shaped. It is distributed in line,and located in dorsal part and both sides of ventral part of the tongue. In the cross-section,its surface is smooth with a circular ditch,and the tongue gland opens in the ring ditch on the outline of three to seven circumvallate papillae. The muscle of tongue is developed. There exist tight junctions between epithelial cells and rich microvilla on the nipple surface. Tongue gland is simple tubuloacinar. Secretory duct is consisted of simple columnar epithelium. There are two kinds of columnar epithelial cells,secretory cells and dark cells. Secretory cells have typical secretory particles,and the mucilage can be propitious to swallow food. The secretory particles are not found in the dark cells. These dark cells maybe associated with the ion exudation and osmotic pressure regulation,but this needs further experimental verification.