Abstract: This is to report the screening, extracting and validating antitumor components and compounds from Stellera chamaejasme L. under the case of discrete distribution of active data.In this work, different components from Stellera chamaejasme L. were collected by HPD macroporous resin and polyamide resincolumn, and their antitumor activity on A549 were tested by MTT assay.Activity results indicate that activity of components at 30-39 min is more potent than that of Stellera chamaejasme L. extract, and the activity ofcomponents at 33.97 min is equivalent to positive drug, cis-platinum at 100 μg·mL^-1, but with totally different mode of action.Under the case of discrete activity, the weight analysis is capable of screening activecomponents and compounds from natural products.