Abstract: Contents of main chemical constituents and physico-chemical indexes of oil of Melaleuca alternifolia L. of terpinen-4-ol type(tea-tree oil) produced by different production processes were analyzed according to ISO 4730-1996 standard. It was found that content of heavy constituent of tea-tree oil produced by small-scale perfumer oil production device was below 5%, which indicated that boiling point of heavy constituents in the oil is too high to be distilled under normal pressure.

Key words: Melaleuce alternifolia L., tea-tree oil, small-scale perfumer oil production device, heavy constituent