To achieve temporal information fusion based on the evidence theory, in accordance with the idea of evidence discounting, a method of temporal evidence combination by considering reliability is proposed. Firstly, the distortion of temporal evidence is identified based on single exponential smoothing. According to the real-time reliability evaluation method of evidence based on the credibility decay model, the real-time reliability of neighboring time nodes’evidence is obtained. Then, the relative reliability of neighboring time nodes’evidence is obtained based on the improved conflict degree and uncertainty degree. Finally, the temporal evidence is combined sequentially based on the evidence discounting theory and the Dempster combination rule. Numerical simulation and analysis demonstrate that the proposed method fully reflects the dynamic nature of temporal evidence combination, and it has a strong conflict information processing ability and anti-interference ability. The proposed method has good applicability to temporal information fusion.