Abstract: In view of problems of single function and low degree of automation of existing coal mine operation and maintenance system, full-text search engine was applied to coal mine operation and maintenance system, and matching solutions were searched from fault solution database through the search engine. Flow of coal mine operation and maintenance system and source, data structure and entry process of fault solution were introduced. By comparing and selecting, Elasticsearch was selected as the full-text search engine of coal mine operation and maintenance system, and its specific application method was given. Example analysis and test results show that search results provided by the search engine are highly correlated with the faults reflected by the alarm content, which can provide effective help for solving the faults.