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To achieve safe and efficient ciphertext retrieval of data in cloud, this paper proposed a scheme of ciphertext index construction and retrieval based on Huffman tree. T le scheme introduced the idea of the Huffman tree structure and its coding into the construction of ciphertext index structure, improved Chinese word segmentation algorithm based on knowledge understanding to extract keywords of plaintext, sorted the search result set through the improved rule of TF-IDF to return the Top-A' results that meet the users’ needs mostly,and added forged nodes of ciphertext index to enhance capabilities of resistance to statistical analysis of the index structure. Through the experimental lest and comparison analysis of performance, it can be concluded that the scheme can improve the efficiency of ciphertext retrieval, which can ensure the security of ciphertext and index simultaneously. [ABSTRACT FROM AUTHOR]