Abstract:In order to explore the potential utilization value and development prospects of Mytilaria laosensis leaves, the nutrient ingredients in leaves were measured. The results showed that the contents of crude protein, crude fat and water in young leaves of 9-year-old tree were significantly lower than those in mature leaves; and the dietary fiber content in leaves of 2- and 10-year-old trees exceed 50%, and total sugar content was 15.04%-16.25%. The vitamin C content in young trees was 1 651 mg/(100 g), and the total flavonoid content was 10 862 mg/(100 g). There were 16 kinds of amino acids in mature leaves of 2- and 10-year-old trees, including 7 essential amino acids and 8 medicinal amino acids, accounting for 38.67%-40.23% and 62.89%-67.43% of total amino acids, respectively. The first limiting amino acid was methionine with SRC value of 64.46-64.48, indicating that the leaves could provide high-quality plant protein. The mineral elements in the leaves showed Zn/Cu< 10 and Zn/Fe< 1, indicating no adverse effects on animal absorption. Therefore, the leaves of M. laosensis contained abundant nutrients, including crude protein, crude fat, amino acids, crude fiber, dietary fiber, vitamin C, total flavonoids, Ca and Se content, showing potential development and utilization prospection in woody feed additives, health functional products, and forest vegetables.