On the basis of the previous observed sympathetic-substance lines(SSL),the mechanism of pilomoter line and hyperaemia of the skin after acupuncture in the rats is explored.When the pilomoter line is formed by the hypodermic injection of phenylepherine at SSL,the skin at the line is transversely severed 2-3()cm wide.In the middle of the section below the line,the thickness of the skin increases as a half-moon.It formes by edma in the hypodermis.The skin samples at the line are cut off and sliced by ice-secti...