Traditional iterated function system (abbreviated as IFS) of the plant simulation and the natural evolutionary process of plants vary widely. This article combines both IFS and genetic algorithm to simulate the morphology of plant. We make the “IFSP code” to be the set of genes in the genetic algorithm; the genes to do this selection, crossover and other genetic operations; set up a reasonable fitness function for evaluation of individual plants, reflecting the nature of species genetic and evolution. Finally, we simulate the fractal characteristics and more in line with the laws of nature plants.