<p>Microbial induced calcium carbonate precipitation (MICP) is an eco-friendly technique that can effectively improve strength, stiffness, and liquefaction resistance. A microbial coral sand pile composite foundation is a novel composite foundation technology that utilizes MICP technology to form local reinforcements in coral sand soil, resulting in the formation of microbial coral sand piles. Through a comparison of shaking table tests, the influence of microbial coral sand pile and acceleration amplitude on the dynamic characteristics of a coral sand foundation was discussed from four aspects: macroscopic liquefaction phenomenon, development of acceleration response, development of pore pressure and surface settlement. The test results showed that the peak acceleration amplification factor, excess pore water pressure ratio, and dynamic settlement of the composite foundation site were significantly reduced compared to those of the coral sand foundation. When the amplitude of the input sine wave was 0.2 g, the composite foundation did not liquefy but the coral sand foundation did. The acceleration amplitude of the composite foundation was greater than that of the coral sand foundation at the same depth. The dynamic liquefaction characteristics and strengthening effects of the microbial coral sand pile composite foundation and the MICP-treated coral sand foundation were analyzed and compared.</p>