This paper introduced design and application of a bar-code scanning device for nucleic acid testing. The bar-code scanning device has been designed for holding smart phones with different size, and it can reduce the influence of outdoor light on bar-code scanning. (本文介绍一种核酸检测用辅助扫码装置设计与应用, 该装置适用于不同尺寸的手机进行辅助扫码, 能够避免外界光线可能对扫码产生的影响。)