Oxidative stress reduced growth performance and impaired immunity of piglets, further lead to depressed husbandry efficiency. The present researches were conducted to investigate whether tea polyphenol (TP) could relieve or eliminate oxidative stress suffered by piglets, and to research the underlying mechanisms from both in vitro and in vivo experiments, which may support evidence as well as new study direction for relieving oxidative stress that piglets had suffered. The main results were listed as follow...