Abstract:Some features of raindrop spectrum in stratiform clouds in spring 2003 of Shaanxi were observed and analyzed in this paper, which are closely associated with precipitating weather systems. The precipitating mixed clouds with deeper cold and warm cloud layers have an appropriate level configuration, and their raindrop number concentrations are bigger up to 103 m-3 and the spectra of raindrops are wider up to 0.32 cm. Conversely, the stable clouds have a smaller number concentration (102 m-3) and a narrower spectrum width (0.22 cm). The raindrops under 0.1 cm in diameter accounted for more than 80% of the total concentration, while the contribution to rainfall intensity is less than 20%. Actually, the 0.1-0.2 cm across raindrop is a major component of rainfall intensity, which accounted for an average 48%-77%. The majority of raindrops had a non monotonic decreased spectral distribution, and the three parameter fitting formula n(Di)=n0Dαe-λD is better than the exponential distribution n(Di)=n0e-λD.