设计了一套采用较直接方式测量水吸收系数的新装置。通过测量直射光穿透不同厚度水层后的辐照度，采用比值法消除了测量仪器对实验结果的影响并得到水层的消光系数；通过混浊水消光实验，证明悬浮物消光系数可由 ?ngstrom公式计算，并提出消除水中悬浮杂质影响的方法。最终得到纯水在400—900 nm波段的吸收系数。所得结果与主流的前人测量成果较为相符，在较长波段具有更好的精度，可作为水质遥感的基础数据。

We designed a new device which can be used to measure the absorption coefficient of pure water directly. First, we measured the irradiance of direct light penetrating through different thicknesses of water layers. Then we used the ratio method to eliminate the impact of measuring instruments on experimental results. Finally, we acquired the extinction coefficient. The extinction coefficient experiment proved that extinction coefficient of suspended substance in water can be calculated by formula of ?ngstrom. We therefore put forward a method on how to eliminate the impact of suspended substance in pure waters. Eventually, we determined the absorption coefficient of pure water from 400 nm to 900 nm. Comparing with previous studies, overall results are consistent, but with better precision in the long wave length. The absorption coefficient of pure water can be used as the normal data for water quality remote sensing.