Abstract: When millimeter-wave cloud radar detects cloud targets, electromagnetic wave not only suffer the attenuation of cloud targets , but also the attenuation of oxygen and water vapor in the atmosphere. Electromagnetic wave attenuation brings that the echo intensity data of radar observations is smaller than that of the actual cloud targets. This error will affect the cloud structure inversion. Thus,meteorological target attenuation correction must be carried out under the millimeter-wave cloud radar frequency in order to inverse exactly the macro physical characteristics of cloud targets by the detected datum of the millimeter-wave cloud radar. In this paper, we researched a precipitation clouds attenuation correction in vertical direction which detected by 3 mm cloud radar at British Chilbolton observation by bin-by-bin attenuation correction algorithm and hierarchical bin-by-bin attenuation correction algorithm and compared their difference. Meanwhile, we conducted the second correction of the millimeter-wave cloud radar detected data by using ITU-RP. 676-10 atmospheric oxygen and water vapor attenuation correction formula. The above analysis and comparison results showed that the change of the attenuation coefficient has a significant impact on the cloud targets macro physical characteristics inversion. The effect of hierarchical bin-by-bin attenuation correction is stronger than that of bin-by-bin attenuation correction.