Abstract: To quantify software reliability, this paper introduces the progresses and methods of using software reliability models to evaluate software reliability, chooses the exponential model to evaluate reliability, according to the trend of failure of a spaceborne embedded software, the principles and methods of choosing models, and the comparison of prediction quality of those models. It executes reliability evaluation based on the software reliability test, and the results of evaluation present the reliability level of this software.

Key words: software reliability, software reliability evaluation, software reliability models

摘要： 为定量评估软件的可靠性指标，介绍了利用软件可靠性模型评估软件可靠性的过程和方法；针对某星载嵌入式软件的失效趋势，根据模型的选择原则和方法，以及模型的预测质量的对比，最终选择了指数模型作为可靠性评估模型。对该软件在轨运行情况进行了可靠性评估，开展了基于该软件可靠性测试数据的可靠性评估，评估结果给出了该软件的可靠性水平。

关键词: 软件可靠性, 软件可靠性评估, 软件可靠性模型