Abstract: Natural infectiolls with Cryptosporidia in chickens,ducks and geese were investigatad at 5chicken farms, 5 duck farms and 3 goose farms in Guangzhou by flotation using Sheather' ssugar solution.In 124 of 882 fecal samples from chickens,273 of 1 004 from ducks,and 71 of571 from gase,cryptospondial oocysts were deted. The positive rates were 14.1%,27.2%and 1 2.4% respectively. According to the morphology and size,the oocysts were identifiedas Cryptosporidium baileyi.