Abstract-CloudComputing has been envisioned as the nextgeneration architecture of IT Enterprise. It moves the application software and databases to the centralized large data centers, where the management of the data and services may not be fully trustworthy. At present, most of the researches on cloud storage security problems are focused on in cloud computing environment. This paper discusses storage security in cloud computing and access control of cloud storage circumstance. In order to solve the problem securely and dependably, we present some application cases such as access control based on LogicSQL database system and trusted computing. Extensive security and performance analysis show that the proposed schemes are highly efficient and provably secure. The aim of the test was to perform sequential and random read/write accesses to the data, as well as more realistic access patterns, in order to evaluate efficiency, availability, robustness and performance of the various dataaccess solutions.