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Distributed generation (DG) provides many potential benefits, such as peak shaving, improved power quality and reliability, increased efficiency, and improved environmental performance. Along with the development of distributed generation, especially renewable energy resources which have been increasingly considered because of environmental concerns and oil crisis, research projects dependent on these resources are being followed with more attention and sensitivity. Among these researches anti-islanding protection of distributed generation units whose duty is preventing of the operation of these resources during network disconnection is one of the most important projects related to distributed resources. In this paper a new method for anti-islanding protection of synchronous generator using negative sequence component of voltage and its damping pattern is presented. The proposed method is simulated and tested in various operation conditions. The test results showed that the method correctly detects the islanding operation and does not mal-operate in the other situations.