Because of their possible role in mediating physiological signals within a whole plant, sieve tubes have been attracting interest from a wide range of researchers. However, the very small volume of phloem sap available for analysis has kept research in this field away from full development. To avoid this problem, we collected phloem sap from sugar palm (Cocous nucifera Linn. cv. Namhom) in the present study. The sap collected from this tropical plant amounted to as much as 3 to 15 ml per hour. This large volume of the sap greatly helped us to analyse various compounds in it. The characterised profiles of proteins, sugars, amino acids, etc. in the sap will be presented.