Using an ultraweak luminescent image d etecting system,the spontaneous and delayed bioluminescent images of Wedelia,Gom phrena globosa bud and callistephus Chinensis are detected.Furthermore,a prelimi nary spectrum detection of Lagerstroemia speciosa lamina is done.Following are t he main results.The intensity and its distribution of plant spontaneous biolumin escence (SL) are different from that of delayed bioluminescence (DL).Generally,t he intensity of SL is much lower than that of DL.The ultraweak bioluminescence r elated to the mitosis and metabolism of a plant sample is strengthened after the sample is illuminated by light.The measured photon count rate of a Gomphrena gl obosa bud after light illumination follows a hyperbolic decay law,indicating the coherence of biophoton emission.The DL spectrum of Lagerstroemia speciosa lamin a is more complex than the fluorescence spectrum of exsomatize chlorophyll and t he former contains more physiological message. -