Five alcaloids: 6-acetonyl-N-methyl-dihydrodecarine (1), 6-acetonyldihydro-chelerythrine (2), decarin (3), iwamide (4) and rutaecarpin (5) were isolated from the methanol extract of the stem barks of Tetradium glabrifolium by various chromatographic experiments. The structure elucidation of isolated compounds was done by spectroscopic methods including ESI-MS, HR-ESI-MS, lD- and 2D-NMR in comparison with the literature values.