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Purpose – Recently, acoustic characteristics of the indoor space are more important due to society economic development needs. Meanwhile, container houses are gradually widely used in quite a lot of space applications for sustainable and easy use features. Those are still need to remain the pleasant and quiet sound environment. The paper aims to discuss these issues. Design/methodology/approach – In this paper, commercial software Ecotect Analysis is used to calculate the sound characteristics of container house. And the decorated material of this small indoor space is redesigned for obtaining the acoustic comfort under the optimal reverberation time. First, three-dimensional model of the container house is constructed by default tools of software. The indoor acoustic characteristics for various design conditions can be obtained by the simulation process. Findings – By comparing the experiment and simulation results, excellent agreement is represented to verify the feasibility of the software. Second, the original container house is caused by reverberation time distribution in 140-315 ms. After selecting the interior material, its reverberation time distribution in 160-680 ms. Originality/value – Following the design process, the spatial designers can assess the indoor acoustic characteristics in concept design stage and good acoustic comfort environment of building is derived. Meanwhile, improve the quality of living and construction costs reducing can be implemented. [ABSTRACT FROM AUTHOR]