A review of the previous reports on species of Dasycladales in China shows there are to date eleven species. In the present report four more unrecorded species are added to the Chinese marine flora, making a total of fifteen species belonging to three genera in two families. Most of these species are confined to the Hainan Island and Xisha Islands, only a few species extending northward to the southern coast of Guangdong and Guangxi Provinces and southern Taiwan. Descriptions of these species together with a working key are presented in this paper. A review of the previous reports on species of Dasycladales in China shows there are to date eleven species. Most of these species are confined to the Hainan Island and Xisha Islands, only a few species extending northward to the southern coast of Guangdong and Guangxi Provinces and southern Taiwan. Descriptions of these species together with a working key are presented in this paper.