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Cloud computing is a new emerging technology. It has been coming forth as an alternative computing environment where web-based services allow for different kinds of users to obtain a large variety of resources, such as software and hardware. Cloud Computing provides a way to share large amount of distributed resources belonging to different organizations through the internet, So it is prone to several types of security risks. Therefore a systematic methodology and process are indispensable to analyze security requirements. The Security policies should be developed for cloud computing systems at multiple levels to threats, risk and vulnerability. Here we discuss about a high order object oriented techniques and methods for construction of robust security policy to build cloud system more reliable and trustworthy.