Objective: To study the chemical constituents from the barks of Zanthoxylum planispinum. Methods: The chemical constituents were isolated and purified by column chromatography and their structures were identified by spectral data. Results: Eleven compounds were isolated from the barks of Z. planispinum. Their structures were identified as norchelerythrine (1), decarine (2), 6-acetonyl-N-methyl-dihydrodecarine (3), arnottianamide (4), platydesmine (5), 4-methyoxy-N-methylquinolin-2-one (6), benzenepropanoic acid, β-[(3-methoxy-1, 3-dioxopropyl)...