Abstract:The physiological active substances coumarin and oligosaccharins extracted from Dendrobium candidum and Panax ginseng were added into the medium (MS+5.0 mg/ 1 BAP+8 sucrose) to induce in vitro tuberization of potato. The effect were compared with those of adding chlorocholine chloride (CCC) on inducing in vitro tuberization. The results showed that when 100 mg/ 1 coumarin was added, the effect On amount of tuberization ap-proximated to the effect of using 500 mg/ 1 CCC.