This invention provides an intelligent operation and maintenance question-answering method,
system, and device based on a
large model. The method includes: performing a
hybrid retrieval on a user question based on a preset
knowledge base to determine the set of text fragments most relevant to the user question; inputting the user question and the set of text fragments into a
large model for
decomposition, generating a set of independent sub-questions; identifying the semantic associations and logical relationships between the sub-questions in the sub-question set, generating a causal graph; performing a secondary
hybrid retrieval on each sub-question to determine the subset of text fragments most relevant to the sub-question, forming a mapping relationship set; inputting the mapping relationship set and the causal graph together into the
large model for correction, determining a corrected set of sub-questions; and inputting the corrected set of sub-questions, the causal graph, and the user question together into the large model for reasoning, generating an operation and maintenance answer that conforms to the
topological order of the causal graph. This invention ensures the coherence and reliability of the question
decomposition and correction process, thereby improving the accuracy and completeness of complex operation and maintenance question-answering.