Abstract: A sand dune with one slope was used as the simplied pattern of a loose slope.Two groups of centrifugal model tests on uniform sand with the sorting coefficient φ=1 and non-uniform sand with the sorting coefficient φ=3.10 were reported.Based on the theory of self-organized criticality(SOC),the SOC phenomenon of landslides and avalanches of loose slopes were analyzed by centrifugal model tests on sand dune.It was indicated that large-scale loose granular mixtures systems exhibited also SOC phenomenon with scale effect.Furthermore,this centrifugal model tests on sand-piles also simulated the modes of the landslides and avalanches of loose slopes induced by earthquakes.It could be concluded from the centrifugal model test results that the landslides and avalanches of loose slopes induced by earthquakes conformed to power formula.