中文摘要：

数据库内容结构分析把共词分析方法应用于全文主题发现，但事先选定种子词和统计共现次数等步骤导致该方法会遗漏很多重要的词汇组合和潜在主题。本文提出使用词汇集聚理论作为潜在主题可视化的理论基础，跳过事先选定种子词和统计共现矩阵的步骤，把词条表示在转置的向量空间中，通过多维尺度模型（MDS）算法把词条在转置向量空间中的邻近关系投影到三维空间图上，通过词汇的空间聚类来发现和表示潜在主题；引入数据编码的方法来克服MDS可视空间容量的局限，并设计了邻近矩阵、质心邻近矩阵、属性叠加邻近矩阵及三个层次的方法流程。最后，成功地将三个层次的潜在主题可视化的方法流程应用于计算机应用服务业上市公司的风险识别。

英文摘要：

Database Tomography analysis applied term co-occurrence method to discover topics in full texts. But it may miss lots of content and topics in the original text set because of its procedure of co-occurrence frequency statistic and pre-selection of seed term. This paper propose to regard lexical cohesion as theoretical basis of underlying topics visualization, skipping the steps of co-occurrence frequency statistic and pre-selection of seed term, to present terms in transposed vector space, to map the proximity of terms in transposed vector space to visual space by Multi-Dimensional Scale （MDS） algorithm, and to discover and present topics by spatial clustering of related terms. Data coding method was introduced to overcome the limitations of MDS visual space area. Terms proximity matrix, centroid proximity matrix, attribute accumulative proximity matrix and according method procedures were developed to construct a three layers method system. Method of underlying topics visualization was successfully applied to do risk identification for public companies of computer application services, using verbal content about risk factor in prospectus as texts collection.