针对国家科技图书文献中心文献检索系统,提出关于二次文献的文献相似度计算方法,设计并实现实时相关文献推荐子系统。最后,从理论上提出对推荐结果进行定量评价的指标,并进行效果评测,验证所设计的相关文献推荐子系统能进一步提高NSTL文献检索系统的服务质量。 Aiming at the document retrieval system of national science and technology document center, this paper puts forward a method to calculate the similarity of document in secondary literature and designs and implements the real-time related literature recommendation subsystem. Finally, the index of quantitative evaluation of recommendation results is put forward theoretically, and the effectiveness evaluation is carried out to verify that the recommended literature-based recommendation subsystem can further improve the service quality of NSTL document retrieval system.