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In order to deeply understand the security features of Windows and explore the flaws of Windows UAC mechanism,the origin of UAC mechanism is firstly introduced,and then its implementation principles are analyzed.After that,various current UAC bypass methods are classified and different types of UAC bypass methods are discussed in detail.Based on the understanding of the existing bypassing methods,the defects of the current UAC mechanism are discussed in depth,and then the improvement scheme of the UAC mechanism is proposed.