Aiming at the storage and retrieval requirements of ciphertext, we propose a new cloud storage model with separate retrieval and sharing functions. We first design a homomorphic encryption algorithm and propose a novel ciphertext retrieval scheme, namely CRSHE based on the model. It solves the problem of keywords privacy leakage and provides support for homomorphic encryption. The retrieval results can be sorted to reflect the correlation degree between documents and keywords, which greatly improves the retrieval performance in multikeyword retrieval. Experimental results show that the scheme is more efficient and accurate than the traditional linear ciphertext retrieval scheme.