WAN Chenshuo, LI Jin, HU Zewen, HU Dehua
LIBRARY TRIBUNE. 2026, 46(9): 80-93.
To address the limitations of traditional entity-relation extraction methods that rely heavily on large-scale annotated data and model fine-tuning,resulting in high deployment costs,this study explores a parameter-free large language model(LLM)-based information extraction paradigm to enhance structural stability and extraction reliability in scientific literature. We propose a structure-enhanced extraction approach based on prompt engineering for LLMs. The method integrates structure-preserving syntactic splitting,dynamic few-shot example selection based on semantic similarity,structured output constraints,and an original-text backtracking matching verification mechanism. In addition,both pipeline and joint extraction strategies are incorporated to guide LLMs toward high-quality entity and relation extraction. Experimental results demonstrate that the proposed method significantly improves the information extraction performance of LLMs. Specifically,Grok-4.1-fast(Pipeline)achieves the best overall performance,with F1 scores of 0.8703,0.5786,0.5712,and 0.7764 on NER,Rel,Rel+,and RE in the SciER dataset,and 0.7939,0.4920,0.4855,and 0.7352 in the SciNLP dataset,respectively. These findings indicate that,without fine-tuning,LLMs can achieve stable and efficient entity-relation extraction from scientific literature,providing a feasible paradigm for low-cost information extraction.