Strong attenuation in rain affects the detection accuracy and application of the X-band radar. This paper aims to seek a method of attenuation correction for X-band dual-polarization radar in precipitation. Before correction, the radar data are pre-processed with quality control; after analyzing all the methods from the past works, an attenuation correction algorithm is developed which is based on the self-consistent method with constraints; finally some validation methods are studied. Some comparisons are made between the corrected composite reflectivity of the X-band radar and a nearby S-band radar observed at the same time; moreover, the corrected relationships between K_DP vs. Z_H and A_H vs. Z_H are also similar to the theoretical values predicted by scattering simulation. In addition, the authors also compare the corrected reflectivity with the surface rain-gauge observations. The analysis results indicate that the corrected reflectivity is more significant than the uncorrected one; specially for the larger area of rainfall (including convective rainfall) using the above attenuation correction algorithm for X-band radar, rainfall amounts can be estimated with higher accuracy.