Abstract: A series of genetic experiments on parthenogenesis has been carried out in Undaria pinnatifita since 197.The nature of this investigation is quite similar to that done in Laminaria japonica,and similar results have been obtained.The.originai materials used to collect the zoospores were taken from the sea shore and the mature sporophytes were believed to be highly heterozygous in heredity.The methods applied were as follows:Isolation of single,individual female gametophytes was carefully made,one slide containing only one gametophyte.Cultivation of the gametophytes was mainly at 15-20℃.Light intensity was about 1500 luxes.Illumination with white fluorescent light was 10 hours a day.The culture medium was made by boiled sea water with the addition of suitable concentration of mineral salts such as P-0.4ppm and N-4ppm.