Abstract: According to the literatures there are 4 species of Najadaceae in inland waters of our country. The writer has explored the Najadaceae in Chinese inland water bodies, and studied up on each species with morphologic-anatomic and cytology experiments since 1979.Two new species and three species of new distribution occur in the inland.The numbers of species and variety of Chinese Najadaeeae may be summed into 11 (including 3 Taiwan species) and 1 respectively. They are: Najas marina L., N.marina L. var. interrnedia (Gorski) A. Br., N.graminea Del., N.minor All., N. moshanensis N. Z.Wang, N.chinensis N.Z.Wang, N. oguraensis Miki, N. japomca Nakai, N. foveolata A. Br. ex Magnus, N. ancistrocarpa A. Br. ex Magnus, N. browniana Rendle, N. indica (Willd.) Cham.