Abstract: Software trustworthiness evaluation is a new direction in software trustworthiness research area， and related theories and methods are still under study. Based on the analysis of the intension of software trustworthiness， a layered software trustworthiness classification model is proposed. The model defines the software trustworthiness attribute model and the classification levels， establishes a reference model for software trustworthiness evidences， and describes the intrinsic relations between trustworthiness attribute， trustworthiness level， trustworthiness evidence and trustworthiness evaluation guideline. The software trustworthiness classification model provides an effective method for building software trustworthiness evaluation mechanism.

Key words: software trustworthiness classification, software trustworthiness attribute model, software trustworthiness evidence, software trustworthiness evaluation

摘要： 软件可信评估是软件可信研究中的一个新方向，相关的理论和方法还处在研究阶段。在分析软件可信内涵的基础上，提出了一种分层的软件可信分级模型。该模型定义了软件可信属性模型与软件可信等级，建立了软件可信证据参考模型，并描述了可信属性、可信等级、可信证据以及可信评价指标之间的内在联系。软件可信分级模型为建立软件可信评估机制提供了一种有效的方法。

关键词: 软件可信分级, 软件可信属性模型, 软件可信证据, 软件可信评估