In this study, it was tried to verify the stability coefficient of newly developed wave dissipating block named Chi-block in the field test. Usually the stability coefficient is determined through the hydraulic experiment and the block is used in the field without in-situ verification. The test breakwater was constructed in Marado and the 5 ton blocks were installed in front of the breakwater with the slope 1:1.5. In order to measure the movement of block the 3-dimensional acceleration sensor was installed in the block and the pressure type wave recorder was installed near the breakwater to measure the wave height which caused to displace the block. The number of blocks to be used for the experiment is 73 and 30 acceleration sensors were installed among them. This experiment starts from the beginning of May, 2017 and was finished in Sep.15 by the typhoon Talim hit Marado, caused displacement of most blocks located near the water surface. It was found that the losses of the Chi-block occurred in the significant wave height of 3.70m ~ 4.09m, which was lower than 4.5m expected from the laboratory tests. This is because the wave direction in the filed was different from that of hydraulic experiment which is normal to the breakwater. The wave hit the breakwater obliquely. This field experiment showed the acceleration sensor monitoring system installed in the wave dissipating block would be useful to check the stability coefficient and the performance of the blocks.