Abstract: Experimented the Tianshan service tree branch,theleaf,the fruit and the root ethyl alcohol withdrawing bacteriostasisfunction with a series of bacteria and the fungus.The resultindicated the certain density the Tianshan service tree branch,theleaf,the fruit and the root ethyl alcohol withdraw the thing tosupply to try the bacterium and the fungus all demonstrated thecertain inhibitory action,MIC and MBC are lower,its bacteriostasisactiveness increases along with the withdrawing density but graduallystrengthens.Therefore the Tianshanservice tree branch,the leaf,the fruit and the root ethyl alcoholwithdraw the thing to be possible to use in food anticorrosion,maintains freshness and so on the domain,has the widespread usescope.

Key words: Sorbus tianschanica, ethyl alcohol extract, antibacterial effect