Abstract: Feeding habits of the planarian Dugesia japonica and the influence of light intensity to their eating behavior were studied by disk method and flume method. The results showed that the sitotaxis of the worms to five kinds of food was in order of fish spleen > bovine liver > earthworm > chicken liver > cooked egg yolk. Light intensity less than 400 lx had no influence on the eating behavior of the worms. A significant effect occurred when light intensity reached 800 lx, under which 96.7% of the worms stopped eating. Under 1000 lx, all of the worms completely stopped eating. The data provided important clues for the further research of evolutionary biology and behavioral ecology of freshwater planarians.