The green algae of Order Chaetophorales distributed in Yellow-Bohai Sea of China are studied. More 3 species belonging respectively to 3 different genera are reported for the first time, viz. Entocladia virid is Reinke, Pringsheim iella scutata (Reinke) H?hnel ex Marchewianka and Ulvella lens P. L. C rouan et H. M. Crouan, with a simple key. Entoclad ia viridis is different from other species in some features, such as disengaged branches in the external frond with concrescentm idsection to distinct cells, irregular, slight swollen and some time distorted atmidsection, and column at external frond with 5～8 μm diameter and 1～5 times high to diameter. Th is species is found in Qingdao and Yantai, Shandong Province, and inner epiphytic to algae, especially to red algae.