The morphological indexes,contents of chlorophyll,soluble protein,soluble sugar and MDA,and activities of several protective enzymes of tomato（Lycopersicon exculentum Mill.）leaf color mutant 06883 treated by different levels of weak light stress were measured in this research.The results show that,under different levels of weak light stress,the decrease value of SLM,VLM,chlorophyll content,activities of protective enzymes and the increase value of plant height/stem diameter,LAR,MDA content of tomato leaf color mutant 06883 are less than that of its wildtype 06884.Therefore,the sensitivity to weak light stress of leaf color mutant 06883 is less than that of its wildtype 06884.It is,to certain extent,tolerant to weak light and could be used as good germplasm resource tolerant to weak light.