Ciphertext search method based on word-for-word indexing

The invention discloses a ciphertext search method based on word-for-word indexing, which comprises the following steps: building word-for-word index information of character-type encrypted attribute in a base table, wherein the word-for-word index information is composed of partial characters selected after plaintext with encrypted attribute is encrypted word for word; and during searching, firstly converting the original search condition related to the encrypted attribute into a middle search condition of the word-for-word index information related to the encrypted attribute, then carrying out primary search in the base table by using the middle search condition, and finally carrying out precise search in the middle decrypted result by using the original search condition. The invention can previously search the content of ciphertext attribute without encryption to obtain a middle result set with relatively high accuracy, thus the method reduces the expenditure for decrypting the middle result set and has higher search performance.