“相关信息密度”指单位文献的相关信息量,它反映了文献的一定量特征,也反映出情报用户的一种通常表达不出的需求。它对于文献情报流的计量以及文献检索系统的改善有着现实意义。 “Relevant information density” refers to the amount of relevant information in the unit literature, it reflects a certain amount of characteristics of the literature, but also reflects the intelligence users an unspoken demand. It has practical significance for the measurement of document information flow and the improvement of document retrieval system.