The characteristics of bath in the international space station including easy to operate, time saving, water saving and energy saving as well as the commonly used bath methods such as shower and free washing method were introduced in this paper. Analytic hierarchy process is a com⁃bination of qualitative and quantitative, systematic and hierarchical analysis method. The concept and application of analytic hierarchy process were analyzed. Based on the evaluation model of bath methods in the space station, the bath methods in space were estimated by analytic hierarchy process. The results showed that the comprehensive weight of free washing system was higher. The result from trade study indicated that the free washing system was the best choice at the present stage of the space station in three aspects including the occupied space resources, technology maturity and washing effect.%介绍了国际空间站洗浴具有操作简单、省时、节水和节能的特点，以及空间站常用的淋浴和免冲洗两种洗浴方法，简述了一种定性定量相结合、系统化、层次化的分析方法和它的应用范围，并在建立空间站洗浴方法评价指标体系的基础上，运用层次分析法对空间站洗浴方法进行评估。评估结果显示免冲洗方法的综合权重高于淋浴的综合权重，表明从空间资源占用、技术成熟度和洗浴效果三个方面来看，现阶段空间站洗浴的最佳选择是免冲洗系统。
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