Semantic Role Labeling (SRL) is believed to be a crucial step towards natural language understanding and has been widely studied. Recent years, end-to-end SRL with recurrent neural networks (RNN) has gained increasing attention. However, it remains a major challenge for RNNs to handle structural information and long range dependencies. In this paper, we present a simple and effective architecture for SRL which aims to address these problems. Our model is based on self-attention which can directly capture the relationships between two tokens regardless of their distance. Our single model achieves F$_1=83.4$1​=83.4 on the CoNLL-2005 shared task dataset and F$_1=82.7$1​=82.7 on the CoNLL-2012 shared task dataset, which outperforms the previous state-of-the-art results by $1.8$1.8 and $1.0$1.0 F$_1$1​ score respectively. Besides, our model is computationally efficient, and the parsing speed is 50K tokens per second on a single Titan X GPU.