Title: MATS: Memory Attention for Time-Series forecasting. Abstract: Long-term time series forecasting (LTSF) is still very challenging in many real-world applications. A fundamental difficulty is in efficiently modeling both the short-term temporal patterns and long-term dependencies. in this paper, we introduce a novel two-stage attention-based LTSF model called Memory Attention for Time-Series forecasting (MATS). In stage I, short-term temporal patterns are extracted to a memory bank such that the input time series is represented by a much shorter sequence of memory attentions. In stage II, a sequence-to-sequence predictor is trained to discover long-term dependencies in the memory attention sequence, and forecast memory attentions corresponding to the time series in the future. The use of attention allows a flexible representation, and its shorter sequence length enables the model to more easily learn long-term dependencies. Extensive experiments on a number of multivariate and univariate benchmark datasets demonstrate that MATS outperforms SOTA LTSF methods almost all the time.