To address the emerging needs of applications that require access to and retrieval of multimedia objects, we are developing an intelligent image retrieval system called FIRS. In this paper, we concentrate on the retrieval subsystem and its support for content-based queries over image databases. Content-based retrieval techniques (statistics, probabilistic, vector-oriented and fuzzy) have been extensively studied for textual documents in the area of automatic information retrieval. This paper show the adaptation of the fuzzy retrieval technique, used by the textual data, in the images' context.