By means of the methods of“reasoning from analogy”and“deduction”in the five evolutive phases of TCM

and understanding that the liver has characteristics of wood

“wood is straight”

and the liver is source of the life

blood vessels like wood in shape with the characteristics of the wood（pliable and though

orderliness

genesis）

explain the relation between the liver and the blood vessels from many angles

considering that the liver controls and governs the blood vessels in the whole body

which provide theoretical basis for treatment of blood vessel diseases based on the liver.