The stability of rock block on slope is an important evaluation index for the prevention of rockfall disaster, This study aims to provide an evaluation method other than stereographic projection and conventional static analyses. A physical model is manufactured to measure and analyze the microtremor characteristics of blocks on slopes designed with different conditions of joint roughness. The results show that when the rock block is stable, the frequency spectrum of microtremor signal is dispersed, and the predominant frequency is not prominent. When the rock block tends to be unstable due to the increase of slope angle, the frequency spectrum is concentrated, and the amplitude of predominant frequency increases in vertical direction and in the direction of potential movement. With smoother surface between slope and block, the frequency spectra of microtremor display a more concentrated figure, and the amplitude of predominant frequency also increase.
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