This study explores whether Silent Sustained Reading(SSR) is helpful of Korean university students to improve English reading ability. Understanding and participation on SSR, interest, confidence and willness on English were questioned before and after SSR. The data were analyzed statistically using the t-test. The result showed that the experimental group did better than the control group on English ability test. In the understanding on SSR, interest and willness on English showed statistically meaningful, but participation on SSR and confidence on English did not showed positive outcome. The findings of this study suggest SSR is effective when it is exposed during considerable long term periods and the need for further research on how to incorporate SSR into the reading curriculum.