Abstract: This paper deals with the three dimensional coupled vibration of block-like resonators by means of the apparent elasticity method, Primarily, the fundamental modes of the coupled vibration of resonators were analyzed, and the frequency equation of the fundamental modes of vibration was derived. From the frequency equation we calculated the resonant frequencies f_x,f_y and f_z of the fundamental modes of vibration of resonators, the frequencies at which the block-like resonators resonate respectively in X, Y and Z directions. The measured frequencies of the blocklike resonators agree well with the calculated frequencies of the fundamental modes of vibration of the resonators.