By using the ground-based and airborne measurements of raindrop size distributions(RSDs) during a precipitation process of stratiform cloud appearing on July 9,1982 in Yinchuan,Ningxia,the characteristics of the surface and upper RSDs are analyzed and compared.It is found that 61.9% surface RSDs exhibit the exponential distribution,whereas 86.4% upper RSDs show the multi-peak distribution.The mean surface and upper RSDs are more suitable to fit with a Gamma function.Result also reveals that the most raindrops near surface are smaller and the most raindrops at the upper are relatively bigger,which is possibly caused by the effects of coalescence,breakup and evaporation of raindrops.In addition,the correlations between the rainfall intensity(I) and the radar reflectivity(Z),the rainwater content(W) and the raindrops concentration(N) are established,respectively.There is a very good correlation between I and Z,and W,but N,parameter N₀ and parameter λ are poor correlated to I.