To comprehensively analyze the nutritional components of sesame stem,explore the potential comprehensive utilization value of sesame stem,and provide theoretical support for the development and utilization of sesame stem resources,three kinds of sesame varieties including white sesame,black sesame and golden sesame were selected.The contents of crude fiber (cellulose,hemicellulose and lignin),ash,total sugar,crude protein,crude fat,amino acids,fatty acids and inorganic elements in different parts of sesame stem were determined and analyzed.The results showed that crude cellulose and sugar were the main components of sesame stem,in which the crude cellulose content of white sesame stem was the highest,up to 78.73%,and the basal part was higher than the middle part and the top part,and the total sugar content of black sesame stem was the highest,and top part was higher than the other parts.Meanwhile,the sesame stem was rich in 15 kinds of amino acids,and the total amino acid content was 14.54—33.93 g/kg,among which glutamic acid and aspartic acid contents were the highest. In addition,the mineral elements were rich in the sesame stem,the content of potassium(6.11—25.80 g/kg) was the highest,and the content of iron was the highest in trace elements which reached 155.50mg/kg.Comprehensive analy sis shows that there are great differences in chemical composition of different types of sesame stem.The crude fiber content of white sesame stem is higher,which can be used as fiber chemical and papermaking raw materials. Black sesame stem has higher contents of sugar and protein,so it can be preferred to be mixed with other raw materials as fodder.