This study focuses on the debugging and repairing techniques for incoherent ontology based on the black-box method and discusses the limitations of the existing black-box methods and their optimizations. To solve this problem, the study proposes a new strategy called clash path for debugging and repairing incoherent ontology. This strategy can construct the clash path related to the basis clash models and then identify the clash set based on the clash path. In this case, deubgging can be rapidly performed based on the clash set because the clash set is smaller than the original ontology. In addition, the unsatisfiable dependent path can be identified from the clash path and the repair set can be easily obtained on the basis of the unsatisfiable dependent path. The theoretic proofs and experimental evaluation demonstrate that the presented debugging and repairing strategies are correct and efficiency.