Objective To realize similar medical records retrieval in medical record database on medical big data platform based on natural language processing technology. Methods The platform index retrieval technology was used for the structured part of medical records; for the unstructured natural language description part, features were extracted and similarity was calculated to retrieve similar medical records based on the constructed medical feature database. Results The system can retrieve the similar medical records in the medical record database, and the users can make auxiliary diagnosis or scientific study analysis based on the retrieval results. Conclusion It is proved that the similar medical record retrieval system based on natural language processing technology is feasible by judging the retrieval results, but its accuracy shall be further improved.

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