Lidar has been widely used in military and civilian applications. This passage mainly introduces a type of lidar used in autonomous vehicle: TOF lidar. The working principle of TOF lidar was introduced in detail. Then based on the TOF lidar, there are two types of lidar to be introduced: scanning lidar and non-scanning lidar. Scanning lidar includes single-line scanning lidar and multi-line scanning lidar. 3D-flash lidar was taken as example to introduce non-scanning lidar. The contents of each type of lidar are system structure, working principle, the development around the world and some problems existing currently. Introduction of lidar development direction is made, including MEMS technology and ZOL technology.