Electron microscopy reveals mature spermatozoon of Tegillaca granosa. The observation shows that the spermatozoon of Tegillaca granosa is of flagellate construction in SEM. The body and head length of sperm is 52 - 58Lm and 2. 7- 2. 9Lm respectively. The mature spermatozoon consists of head, middle piece and tail in TEM. The acrosome is V-shaped in upside-down, and the top of V-shaped inflate to become a globoid in which there are many tiny particulate material. The unclear is egg-shaped with high electron-density. The vesicle was found in the unclear-region, and it is in different position. Two centrioles and f ive large globular mitochondras form middle piece of sperm. The centrioles are of cylindrical hollow construction surrounded by f ive mitochondras bodies and separated from the basal plate of the tail. A satellite body was found at the basal part of the distal centriole. The f lagellum is a typical / 9+ 20 microtubular structure limited by the cell membrane.