Sound Source localization is always of great value in many engineering applications. In these types of localization appliances, several microphone transducers are usually involved in the localization structures. Each of the arrival times of the Sound stimulus applied to these microphones is determined individually and sent to the arithmetic-logic sections immediately by which the localization systems could find Out positions of the sound sources Subsequently. But these appliances always consist of many components, and the looseness of structures may narrow their practical applications. In this paper, a new type of instrument is designed to accomplish the purpose of localizing the Sound Source by a relatively compact structure. This bionics structure is designed to mimic the localization function of the ears of the parasitoid fly Ormia ochracea, and it consists of three elastic diaphragms, three bars which connected to the diaphragm, and the other mechanical components. The analysis of this structure's dynamic behavior shows that the incident angles of the Sound have special relationship to the responses of this instrument, and the incident angles can be estimated by detecting the vibrations of the three elastic diaphragms. Compared with traditional microphone arrays, this Instrument has the advantage of compaction and higher integrated level.