Abstract: In modern livestock production，heat stress has become the one of the important factors，restricted the broilers growth, metabolism, meat quality and physiological functions，for breeding brought serious economic damage. Heat stress proteins （HSPs） is a group of specific proteins that produce under adverse factors，and HSP70 is one of the most conservative and the most important members of the family.It has may perform a series of biological function，such as molecular chaperone，enhancing tolerance and antioxidant injury and so on. It can make the body quickly adapt to the environment changes and in the heat stress it play an important roal. This paper introduced the effect of heat stress on broilers, the biological characteristics and the heat stress mechanism of HSP70, in order to provide theory basis functions for exploring anti-stress mechanism of HSP70 from medicines level.

Key words: heat stress; broilers; heat stress protein 70