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To purify the natural antikeratin autoantibody (AK auto-Ab) and observe its effects on the proliferation of the cultured keratinocytes. Methods: Natural AK auto-Ab was purified by using keratin affinity column, and then the titre and specificity of the Abs were studied by ELISA, immunoperoxidase staining and immuno-electronicmicroscope. The effect of the purified Abs on the cultured keratino-cytes was assayed by 3H-TdR incorporation. Results:Natural AK auto-Ab was obtained. The binding activity of IgG AK auto-Ab in purified Ab remained similar to that in pooled human sera, and the specificity of the obtained antibody is strong. The purified antibody could decrease the 3H-TdR incorporation of the cultured keratinocytes in a dose-dependent manner. Conclusion: The method of purifying AK auto-Ab is simple, practicable and reliable. Natural AK auto-Ab, existing in normal human individuals, has inhibitory effect on the proliferation of the cultured keratinocytes.