Abstract: The effects of light intensity (100%,62.29%,35.17% of full light radiation) and different exposure times on biological characteristics,physiological indexes and flavone content of Kalimeris indica were studied.1) With increased treatment time,the internode-length of all treatment types showed an increasing trend,but shading inhibited K. indica’s internode-length elongation,especially at 62.29% of full light radiation. Shading stimulated K. indica’s branching ability at 35.17% of full light radiation,but this was not significant at 62.29% of full light radiation. Shading,especially light shading,inhibited erect growth of K. indica. Deeper shading (35.17% of full light radiation) was conducive to increased leaf length,width and sawtooth,but was not significant at 62.29% of full light radiation.2) Chlorophyll a,b and total chlorophyll content decreased at 35.17% of full light radiation. The content of O2-· increased after an initial decrease and then decreased again with an increase of exposure time to light radiation. The activity of SOD and the MDA content increased after an initial decrease with time while the activity of POD showed the opposite trend. With a reduction of light intensity,the activity of POD and MDA content increased and the activity of SOD also increased after an initial decrease. At 35.17% of full light radiation,K. indica’s CAT activity was significantly lower than that of the control. 3)With a decline of light intensity,the flavonoids content decreased in the leaves,increased in the roots and was highest in the stems at 62.29% of full light radiation.