The present invention relates to an administration method for a preparation containing oseltamivir carboxylate guanidino analogues and/or ethyl esters thereof, the administration being carried out via inhalation. The present method treats colds caused by influenza viruses, and reduces dependence on a single type of drug, such as oseltamivir, zanamivir or peramivir, thereby preventing new resistant virus strains from being created due to widespread use of a single type. The present method also provides for the oseltamivir carboxylate guanidino analogues and/or ethyl esters thereof a method for greatly improving bioavailability compared with oral administration or intravenous drip injection. More importantly, the present method utilizes small doses, has fewer side effects and is fast-acting.
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