We propose a slice-level SAO on-off control method that can be applied in the parallel HEVC encoding scheme. To be applied in the parallel encoding scheme, our method does not use any information from the previous encoded frames. Our method uses the GOP level and slice quantization parameter, which are given before starting the current frame encoding. Our experimental results shows that our method can control SAO on-off in the slice level with very small amount of loss than the method that is hardly employed in the parallel encoding scheme.