The transport of water in plants is maintained through energy metabolism by the living cells. Photosynthetic products, sugar play a role to regulate the osmosis of phloem that can be transported and also flow the stream of conduct water. Excess transpiration caused embolism in xylem not to ascend the sap, but phloem could restore the function of xylem by secreting the waiting solution(majoong water). Such an transport reaction can be analogy to the animal blood circulation that is related artery as phloem and vein as xylem, and is regarded as the process of energy requirement. The previous hypothesis was simply a physical phenomenon of xylem water to be pulled by the stream of transpiration that is known as tension-cohesion theory, but the process of circulation promoted by phloem can be energetic to protect the water content of vessel from the transpiration by osmotic pressure and can repair the function of xylem by reverse-osmosis. This energy-required process can re-uptake the water from the soil.