Investigating the microphysical parameter characteristics of precipitation in different cloud systems is of considerable significance to study the precipitation mechanism, weather modification, radar quantitative measurement of precipitation, and selection of the microphysical parameterization schemes using numerical prediction models. Further, the microphysical parameters of precipitation in different cloud systems were studied and evaluated on the basis of the micro rain radar (MRR) data in accordance with the liquid precipitation process that occurred in Jinan, Shandong Province, in 2015. The rainfall intensity samples of the stratiform precipitation were quite large at 0.02-0.2 mm h^-1 at an altitude of 400 m; however, their contribution to the cumulative precipitation remained relatively small. The number concentration of large particles was high in convective and mixed precipitation. The particle diameter in case of stratiform precipitation was relatively concentrated in the vertical profile, and the average D₀ was observed to be approximately 1 mm below an altitude of 1,400 m. Further, the vertical airflow (including the updraft and downdraft) considerably impacted the particle diameter when the rainfall intensity of the convective precipitation became greater than 20 mm h^-1; the data quality of the precipitation parameters retrieved by MRR was relatively poor, especially at upper range gates. Meanwhile, the MRR data can be used to analyze the vertical evolution of the raindrop spectrum below the bright band during stratiform precipitation, which is minimally impacted by the vertical airflow.