About 50 species of Microcystis so far have been reported in the world, and 19 species were described in China. During our recent investigations for water-bloom forming blue-green algae in China, a diverse group of Microcystis species occurring in some waters can be easily observed. Among these species, some have never been described in China. The present paper reported three newly recorded species of Microcystis: M. novacekii (Komárek) Compère 1974, M. smithii Komárek & Anagnostidis 1995, and M. botrys Teiling 1942.