Abstract: Through studing on physical characters of Sampium sebiferum in Guizhou by means of gas (liquid) chromatography, infrared and atomic absorption spectroscopy, and streening electron microscophy, 2 fine varieties have been screened out. The oil contained in S. sebiferum can be divided into two kinds: wax substance oil and stillingia oil. The research results show as follows:(1) The two kinds of oil are mainly triglyceride. Most of the fatty acids contained in the wax substancc oil are saturated fatty acids, while most of them in the stillingia oil are unsaturated one. There is a positive correlation between the oil content of whole seeds and the percentage of wax substance oil, and palmitic acid in the wax substance oil has a negtive correlation with oleic acid.(2) There are 14 hydrolytic amino acids in wax substance oil, which make up p.4—1.0% of the wax substance oil, 17 hydrolytic amino acids in stillingia oil, which account for 8.5—21.4%.(3) Many trace elements in the seeds and their coat oil (wax substance oil) are necessary for human bodies, among which K, Fe and Zn contents have significant correlations with the quality, species of S. sebiferum, as well as seed harvest time.(4) The seed microstructure of one S. sebiferum variety is different from that of other varieties.(5) The influences of seed harvest time and storage life on the qualities of the wax substance oil are obvious.

Key words: S. sebiferum, Phymical character, Quality