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This paper discuss embedded intelligent monitoring system based on DaVinci. This scheme analyse the technique about moving detect invasion target using background subtraction of image sequence, apply median method to maintain background in order to have great adaptability and realize warning algorithm based on DaVinci hardware platform. The experimental results indicate that using median method can adapt to the environmental change, detect invasion target and acquire direction of motion, meanwhile, send out warning signal within 0.5 seconds, therefore, fulfill system requirement of real-time.