According to the actual performance characteristics of the millimeter wave cloud measuring radar in Pinghe Area of Fujian Province, and in response to the problem of range sidelobe artifacts in operation, an improved data quality control method is proposed. Using the observation data in Pinghe of Fujian Province from September 2018 to August 2020, the quality of the radar is quantitatively evaluated to study the actual impact of data quality control on cloud-precipitation detection. The results show that the proposed method can well improve the radar detection measurements, and the range sidelobe artifacts can be effectively filtered. The range sidelobe also significantly affect the radar’s detection of airborne cloud and rain echoes. The impact is most concentrated near the starting height above the blind zone of the two wide pulse modes, namely 1.50-2.28 km and 3.63-7.74 km, and the frequency of range sidelobe artifact decreases as altitude increases. The range sidelobe artifact mainly interferes with radar detection of low and medium level weak clouds, thus leading to underestimation of cloud base and overestimation of cloud top and cloud thickness. The average errors of three cloud parameters can reach -0.53、0.74 and 0.73 km respectively.