Based on a ground improvement project on a reef island in the Red Sea, Saudi Arabia, vibroflotation trials with varying parameters were established to elucidate the reinforcement mechanism of soil. Addressing issues encountered during construction, optimization measures such as “reducing the lifting step distance, lowering water pressure during the lifting phase, multiple re-penetrations, and extended vibration retention” were proposed. The improvement effects under different parameters were compared and post-treatment acceptance curves for vibro-compaction were derived from Cone Penetration Test (CPT), Plate Load Test (PLT), and Zone Load Test (ZLT) analyses. Settlement result reveals that a 3 m and 3.5 m spacing with a triangular layout resulted in a foundation settlement of 10.22 mm, meeting the design requirements. Post-treatment liquefaction resistance calculations for the test zones all exceeded 1.0, satisfying the liquefaction design criteria. And the improvement effect of the 3 m spacing trial area was better.