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Light quality control is an important part of plant factory.How the light affect plant growth should be analyzed,it will contribute to determine the best facilities lighting solution.Light intensity,spectrum and photoperiod can be controlled Intelligent.This paper designs real time spectral imaging and intelligent light control of facility agriculture based on Internet-Of-Things(IOT),including spectral cube analysis,image data processing,Light-Emitting-Diode(LED)intelligence supplementary light array optimization and so on.We can see the spectrum distribution intuitively by analyzing of spectral cube.Through analyzing the data of spectral Imaging,it will contribute to know the growth of plants and pest diagnosis.The optimum array control of LED fill light may largely advance the rate of light using.This system also can achieve real-time and long-range control of light quality.Making use of data acquisition carrys out the digital imaging processing.This will offer several ways to supplement light..In order to chose the best one,simulating illumination by optical-design software----Trace prion.During the supplement,real-time spectral date was collected again,compared with dynamic expert database system.Next we will introduce some sampling survey and experimental research about intelligent control in this paper.