Abstract: Grass is an important element of nature scenery,but a grassland is difficult to render in real-time due to its large amount of grass and wide covering range.Consequently,realistic simulation of large-scale grassland turns to be one of the challenging topics in computer graphics.This paper provides a survey on the realistic simulation of grassland in the last two decades,with a detail introduction to the rendering,LOD,dynamic simulation techniques and the industry status.Some fundamental principles,merits and drawbacks of the typical methods are analyzed and compared.Finally,the future development on this topic is outlined.