Two types of centrifuges exist in geotechnical model tests: beam centrifuge and drum centrifuge. The authors have designed, constructed and utilized two samll diameter drum centrifuges since 1985. They have examined the applicability of the drum centrifuges to geotechnical model testing, including problems of self-weight consolidation, liquefaction, behaviour of buried piles during earthquakes. This report summarizes their five years experiences and discusses the potential use of the drum centrifuge.