In order to solve the problem of massive data storage and satisfy the requirements of data confidentiality and integrity in smart grid, this paper analyzes the characteristics of the existing security storage solutions, then combines with the special occasions in smart grid, and finally designs a security storage solution based on Hadoop. This schema separates the key from the cipher text management by fully using the advantages of high-performance in HBase and modern cryptographic technique. Its main features are high-level security, high efficiency and convenience in key management. A prototype system based on Hadoop for smart grid is developed, and the time-consuming of this program is also analyzed. The corresponding experiments prove that the design is effective and feasible.