Abstract: The smut of bamboos attacked various bamboo, spring tip and bamboo shoots. Black flours appeared on the end of tip. Except spring tips, secondary tip didn’t suffer bamboo smut. The pathogen chlamydospore haven’t a resting period when they are germinating with relative humidity 98?00%, the most fit temperature 20~24℃. During germination, a very short germ tube is produced and basidiospore grows as a budding way. Chlamydospore lasts one month. Most plant gets infected all over the body, year after year, and bamboo lash of infected plant is connected together. Consequently, the every probable disease is plant disease of systematic infectivity. Perhaps, the pathogen infection gets through young shoot of bamboo lash from surface of earth.