The present invention relates to a process for preparing acid salts of Gemifloxacin, a quinolone type antibiotic agent having potent antimicrobial activity. The process according to the present invention can provide advantages such as simplicity of process, improvement of productivity and improvement of yield, and the like by reducing conventional three-step process to two-step process.Predstavljeni izum se odnosi na proces pripremanja kiselih soli Gemifloxacina, kinolinskog tipa antibiotskog sredstva koje ima jak antimikropski učinak. Postupak, sukladno predstavljenom izumu može osigurati koristi kao što su jednostavnost postupka, poboljšanje produktivnosti i iskoristivosti i slično smanjivanjem uobičajenog procesa od tri koraka na proces od dva koraka.