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For a long time, the statistics and fractal theory are two applied target detection in sea clutter, respectively. The CFAR method can adaptively adjust detection threshold according to the background noise、clutter power or interference power of radar echoes cell when it instead of a fixed threshold. The CFAR detection method and the 2D-IFS (two-dimensional iterated function systems) are introduced in this article. Next, use the 2D-IFS algorithm to calculate the prediction error of radar echoes, novel weak target detection methods is proposed combined with CA-CFAR algorithm. Finally, validated by the real sea clutter data, simulation results show that the proposed method for low SNR (Signal to Noise Ratio) target echo has a good detection capability.