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Objectives:Pinellia ternata is a shade-tolerant perennial medicinal plant,but its optimum light intensity is little information.Methods: Four light conditions: 100%irradiance,45%irradiance,25%irradiance,and 15%irradiance,a greenhouse experiment was conducted to analyze growth traits,photosynthetic pigmentscontents,peroxidase(POD)and catalase(CAT)activities,malondialdehyde(MDA)content,total alkaloid,guanosine and succinic acid contents and yields.Results: The fresh and dry tuber weight,leaf area,tuber number and propagation index were highest in P.ternata grown under the intermediate light level(45%sunlight).In contrast,15%sunlight induced the lowest growth parameters but the highest plant height.Sunlight from 15%to 45%significantly increased the chlorophyll concentration compared to that under full sunlight conditions.Moreover,100%sunlight enhanced the POD and CAT activities and induced MDA,total alkaloid,guanosine and succinic acid accumulation.The maximum yields of total alkaloids,guanosine and succinic acid occurred under 45%sunlight.Overall,45%sunlight was the most efficient way of improving the tuber yields and qualities of P.ternata.Conclusions:P.ternata is suitable for growth in a moderate-low-light environment and that appropriate light control can produce higher tuber and secondary metabolite yields within agroforestry systems.