Abstract: Two methods, soaking seeds and dropping apical buds of rhizomes, are adopted to induce polyploidy of Amorphophallus albus. In order to obtain the most effective method of induction polyploid, the seedling rates and variance rates are compared by different concentrations of colchicine solution and different treatment time. The result shows that the seedling rates and variance rates of dropping rhizomes buds are higher than those of soaking seeds method, but the effect of induction polyploidy is inferior to soaking seeds. One tetraploid of A. albus is gotten by soaking seeds for 48 hours with 0.20% colchicine solution.