In order to improve the maintainability and scalability of geophysical software, this paper applies plug-in software architecture to developing Geophysical Software Platform (GeoProbe). Based on a study of plug-in and its key development technology, this paper introduces the design ideas of GeoProbe's plug-in interface and its management and calling mechanisms used in GeoProbe software platform in details. Applying the plug-in technology, the authors developed a new generation of airborne geophysical data processing and interpretation system on the platform, in which the scientific research achievements in the airborne geophysical exploration technology system program (863 major program) were integrated comprehensively. The system mainly includes aeromagnetic survey system, airborne gravity survey system, time-domain airborne electromagnetic survey system and airborne gamma-spectrometric survey system.