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This paper presents in detail an analysis of the ability of data hiding capabilities. According to the human visual features, this paper uses edge degree which can be computed by log points, and combines distributed evenly degrees with sigmoid function which is adopted to describe bright hiding capability, and proposes an effective method to measure the data hiding capability. Moreover, this paper implements embedding and distilling watermark based on the frequency modulation. Using the idea of frequency modulation that belongs to communication engineering, and bringing up "frequency modulation watermark" which different to traditional watermark technique, we constitute base band signal by select the intermediate frequency coefficients of image piece which has strong data conceals ability, then, embedding and picking up watermark according to the idea of frequency modulation. This kind of watermark technique can give attention to invisibleness and robustness, and realize blind examination efficiently. The experiments show that the technique has the properties of combing invisibility and robustness as well as achieving efficient blind detection.