The invention provides a Chinese medicament for treating asthma. The Chinese medicament consists of fifteen medicaments including ginkgo seeds, ephedra, common coltsfoot flowers, pinellia tuber, tangerine peel, white mulberry roots-barks, poria, largehead atractylodes rhizome, perillaseed, baical skullcap roots, apricot kernels, astragalus, radix glycyrrhizae preparata, jujubes and tokays. A preparation method comprises the following steps of weighing the tokays in parts by weights, and grinding the tokays into powder; weighing the other fourteen medicaments in parts by weights, adding cold water in a way that a water level is higher than a medicament level, impregnating the medicaments for 0.5 to 1 hour, boiling a mixture with high flame, decocting the mixture for 20 to 30 minutes with low flame, and filtering the mixture to remove dregs to obtain liquid medicine; performing decoction twice, mixing the liquid medicine obtained by twice decoction, boiling the mixed liquid medicine, and decocting the mixed liquid medicine for 3 to 5 minutes. The Chinese medicament has the effects of relieving cough and asthma, reducing phlegm, reinforcing qi, clearing heat, removing toxicity, nourishing blood and promoting blood circulation to remove blood stasis, has good effects, and can quickly take effect, and the toxicity and the adverse effects of the medicament can also be reduced, so that the aim of comprehensively recovering various physiological functions of tracheas and lung tissues is fulfilled.