In this paper,the authors address the problem of biotical vessel segment in the vessel images taken from human body'S burned skin．These blood vessels have poor lo-cat contrast with multi—diameter，and take on network distribution．The authors intro-duee an algorithm based on the optical and Spatial properties of objects to he recognized．Through sefinning the vessel image in various angles．anaiysing the glay—level profile of the cross section of blood vessels and detaching vessel image according．to vessel diameter，they could obtain the fixed quantity distribution of biotical blood vessels．This segmenta-tion algorithm is efficient and automatic，it can help physicians in diagnosing diseases and show promise in many relative fields．