Abstract: Leveraging a sliding window strategy, this study presents an innovative retrieval-augmented generation system aimed at enhancing the factual accuracy and reliability of outputs from large language models (LLMs). By applying a sliding window mechanism during the indexing phase, the project effectively addresses the limitations of fixed context window sizes and static retrieval methods. Three specific sliding window strategies have been proposed to efficiently process and segment texts: Fixed Window Size and Fixed Step Length Split (FFS), Dynamic Window Size and Fixed Step Length Split (DFS), and Dynamic Window Size and Dynamic Step Length Split (DDS). To further enhance retrieval accuracy and relevance, the project employs multiple advanced query techniques, including query expansion and reformulation. Rigorous experimental evaluations were conducted using the state-of-the-art Llama-3 model across multiple diverse datasets, encompassing both general knowledge and domain-specific corpora. Results demonstrated optimal performance with a carefully calibrated block size of 1 024 tokens and a step size of 3, significantly improving the F1 score across various tasks. This configuration highlighted the critical importance of balancing document segment length and sliding window step size to maximize information retention and retrieval efficacy.The sliding window strategy effectively preserves contextual information, reduces information loss, and exhibits adaptability across different datasets and query types.