Abstract: To address the security of data aggregation and stimulation on smart grid, propose a paillier-based secure data aggregation and rewarding scheme in the smart grid. Use a superincreasing sequence to structure multidimensional data and encrypts the structured data by the homomorphic Paillier cryptosystem technique. For data communications from users to the smart grid management center, data aggregation is performed directly on ciphertext at public cloud servers without decryption, and the Hash-based Message Authentication Code (HMAC) is added to the ciphertext to prevent tampering. The aggregation result of the original data can be obtained at the management center. In order to achieve an efficient and anonymous photovoltaic power generation reward scheme, introduce blockchain and ring signatures to achieve two-way anonymity between the grid management center and users. Adopt the batch verification technique to reduce authentication cost. Through analysis, the scheme can realize efficient and safe smart grid data aggregation and excitation under the premise of ensuring data integrity and user anonymity.