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This study is to improve the worst lightfastness of a natural dye. To modify the fiber surface, low temperature oxygen plasma was carried out on silk fabric. The result is followed below after the examination of surface shape, dyeability, color change, UV absorbent influence and lightfastness.1. When electric discharge outputs are 60W, 80W and 100W, and processing times are 10minutes, 20minutes and 40minutes, the etching effect of surface increased as electric discharge outputs and processing times increased.2. When examined UV absorbent for 5hours, 10hours, 20hours, 40hours and 80hours, the value changes of ΔE are 1.47, 2.51, 2.91, 3.71, 4.51 and 5.31 in case of A1 pre-mordanting/ plasma 80W, 20min./ UVabsorbent 5% (100:1), 2.31, 2.47, 3.84, 3.90, 3.61 and 4.42 in case of Al pre-mordanting/prasma 80W, 20min./ UV absorbent 5% (o.w.f.). The lightfastness decreased when UV absorbent increased.3. Dyeability of the samples pre-treated with five different methods was in the following order: plasma processing for 20minutes at 60W/A1 pre-mordanting > A1 pre-mordanting > plasma processing for 20minutes at 60W > A1 after-mordanting > non mordanting. Plasma treatment had superior effect on dyeability.4. When UV absorbent was applied in fabric, the sample under higher electric discharge out puts showed more effective in improving lightfastness.