With the widespread application of cloud computing technology, cloud servers have become an important platform for enterprises to store and process data. However, the integrity and security issues of data in cloud servers are becoming increasingly prominent, and how to ensure the integrity and credibility of data has become an urgent problem to be solved. Data integrity verification technology, as an effective means, can verify the integrity and consistency of data in cloud servers, thereby ensuring the security and credibility of data. This article will provide a detailed introduction to a data integrity verification technology in cloud servers based on attribute encryption algorithm SM9, including its principles, application scenarios, technical implementation, and optimization strategies. In a multi-client cloud data storage scenario, the data generated by each client is synchronized to the ECS, but in the multi-client scenario, it is more difficult to verify the risk of data tampering. This solution uses the attribute characteristics of the device, which can be the IEMI or MAC address information of the device, to perform an extensible ring signature on the data generated by the device, so as to ensure the integrity verification requirements of all data generated by the device, and can more efficiently and flexibly ensure the integrity of the data generated by multiple devices.