Seed dispersal is the movement or transport of seeds away from the parent individuals in some ways to germinate and then settle seedling in appropriate habitats.The ways of seed dispersal are divided into active and passive type,and the latter way includes wind dispersal,water dispersal,animal dispersal and human action dispersal.The dispersal ways of plant seeds are suitable to its living environment to a large extent,and the plants in different habitats have adapted to their ways of seed dispersal,and morphological and structural characteristics of seeds are often matched its dispersal way.In the long-term,co-evolution,a symbiotic relationship,was formed between plant and animals of dispersing seeds,which is of great importance to maintain the structure and stability of community.