Abstract: Field expreiments were conducted to investigate the effects of pig manure on tiller numbers,plant height and grain yield of rice (Oryza Sativa L.)grown on arsenic-toxic soil in Southern Hunan Province. It was found that the application of pig manure reduced the total tiller numbers,productive tiller numbers,plant height and grain yield of the rice significantly because the manure increased the phytotoxicity of soil arsenic to the plant.Therefore pig manure was unsuitable to be applied to rice grown on arsenic-toxic soils.