NOVELTY - An Iris tectorum Maxim planting method involves preparing impregnated aqueous solution by taking commercially available brassinolide original powder dissolved in ethanol, and adding clean water. The mixture is stirred to dissolve completely to obtain impregnated aqueous solution of brassinolide. Impregnation and cuttings processes are performed by clipping stems after flowering, cutting the leaves into small pieces to the lower internode, immersing stems in impregnated brassinolide aqueous solution, followed by spraying aqueous solution of brassinolide at the beginning of flowering.    USE - Method for planting Iris tectorum Maxim.    ADVANTAGE - The method enables planting Iris tectorum Maxim with increased propagation scale of 2-3 times compared with a conventional root division method, shortened planting period, improved yield (higher than 50% to the maximum extent), decreased plant diseases and insect pests, and without pesticide residue and environmental pollution, in simple, easy and cost-effective manner.    DETAILED DESCRIPTION - An Iris tectorum Maxim planting method involves preparing impregnated aqueous solution by taking commercially available 0.2%, 3-6 mg brassinolide original powder dissolved in 10 ml ethanol, and adding 100 l clean water. The mixture is stirred to dissolve completely to obtain impregnated aqueous solution of brassinolide. Impregnation and cuttings processes are performed by clipping stems after flowering, cutting the leaves into small pieces to the lower internode, immersing stems in impregnated brassinolide aqueous solution for 1-2 seconds, plugging in the cavity, covering with fine sand, planting short internode stems in soil surface with distance of 0.5-1 cm, planting density spacing of 25 cm, 20 cm, inserting 1-2 segments in each hole, watering, covering with plastic film and removing plastic film. Extraradical spraying process is performed by spraying liquid formulation by taking commercially available 0.2%, 0.5-3 mg Brassinolide original powder, dissolving in 10 ml ethanol, adding 100 l clean water, stirring to dissolve completely, sprayed aqueous solution of brassinolide at the beginning of flowering for 1-3 times, once every and interval of 6-9 days, and spraying an aqueous solution on the leaves of plants on up and down directions.