It is 67 km far away from a S-band radar located in Jinan to a C-band radar on the top of Mount Tai in Shandong province. In order to quantitatively analyze the differences between two radar reflectivity observations and the relationship between S and C-band radar observations, 10 cases from radar measurements with obvious echoes lasting at least 2 h during 2007—2010 are selected to compare CAPPI reflectivity data at the altitudes of 2, 3, and 4 km. It is shown that the probability densities of the CAPPI reflectivity at three heights observed by two radars are consistent obviously. The average reflectivity obtained from S and C-band radar increases with height from 2 to 4 km, and the S-band reflectivity is about 2 dBz higher than that of C-band at the same height. There are 6 CAPPI cases when precipitation appears at 3 km, all of the average reflectivity observed by two radars are smaller than 30 dBz and the best agreement between two radars in 6 cases belongs to June 29, 2007. However, the average reflectivities of S-band for the rest 5 cases are all above 30 dBz and have great discrepancy between two radar measurements, especially for the case on July 8, 2008. In general, when average reflectivity of two radars is less than 30 dBz, and only a few proportions of high reflectivity(>30 dBz) is available, two radar reflectivity measurements are consistent due to the slight attenuation in C-band observations; while the average reflectivity of S-band radar exceeds 30 dBz with a significant proportion of strong echo(>30 dBz), there exists remarkable difference due to C-band attenuation.