Abstract: As one of the elements contributing to landscape , patches have direct effects on the spatial patterns of landscape and functional interactions among the landscape cells. Patch dynamics leads to the change in landscape patterns. Heterogeneous patches commonly occur in tropical forests. This is to say , climax forest also maintains patches of different species composition and community structure. Forest growth cycle induced by natural events or human disturbance brings about the spatial mosaic of different patches. In any spot of forest , the patches at different growth phases , i. e. , gap phase , building phase and mature phase , turn over. In the process of the growth cycle , the replacement of floristic elements takes place , too. These patches , on the other hand , shift on the forest background. The species diversity of tropical forests is maintained in the dynamics of forest patches.