The invention relates to an application of renqingchangjue (a combined traditional Chinese medicine) to preparation of drugs for treating ovarian cancers. The renqingchangjue is condensed pills, sugar coated tablets, thin membrane coated tablets or capsules prepared by preparing active ingredients from medicinal materials in a recipe, wherein the active ingredients are selected from one or more of a petroleum ether extract, an ethyl acetate extract, an ethanol extract and a water extract. According to the application, the technical prejudices of conventional technical applications are overcome; a pharmacological experiment discovers that the extracts of the renqingchangjue have better inhibition effects on ovarian cancer cells in vitro, and the effects are the same as or slightly superior to the effect of cis-platinum; the drug serums of the extracts of the renqingchangjue also have remarkable inhibition effects (P(0.05)) on the ovarian cancers in vitro, and the effects of the petroleum ether extract, the ethyl acetate extract and the water extract are slightly superior to the effect of the cis-platinum.