Abstract: Soil collapse appears around the hole after completion of the soil build and cavitation action in a potted soil build and cavitation system. To improve the situation, the discrete element simulation model of the key equipment for the soil build and cavitation was established, and the simulation analysis of soil interaction was conducted during the process of the soil build and cavitation, and the mechanism of function failure of the current prototype was explored. Simulation results show that after compaction is completed, the compaction module releases pressure, the compressed energy of the soil shows a trend of increase from the top to the bottom, resulting in lower soil compactness, and causes the subsidence of subsurface soil when the core lifts off. The system performed a functional analysis based on the failure mechanism and the TRIZ theory, to clear the interaction relationship between the various components, the existing system problems were analyzed to explore the existing technical contradictions and physical contradictions in the cavitation process. Using the TRIZ conflict resolution principle and the separation principle resolved contradictions to complete innovation and optimization design on key equipment of potted soil build and cavitation. A test platform with adjustable parameters was set up, tests show that the soil integrity of compaction module scheme 2 increases by about 8% than compaction module scheme, and all above 95%; therefore, tests verifies the rationality of innovative design and the feasibility of innovative method.