Abstract:Using the observation data of microrain radar, raindrop disdrometerand rain gauge at Jingyu station Jilin Province from 24 to 25 August 2021, the vertical distribution of raindrop size and the evolution of microphysical characteristic parameters for a mixed cloud precipitation process at Changbai Mountain foothills are analyzed. The results show that the rainfall variation trends which are detected by microrain radar with high resolution of 150 m, raindrop disdrometer and rain gauge are basically consistent, but there are some deviations between observed values and inversion values. The Gamma function goodness of fit clocks up 0.99 for ground raindrop size distribution, which is better than that of micro rain radar.In addition, the fitting value for number concentration of large raindrops (D>3.0 mm)inverted by micro rain radar is significantly smaller.. Research also shows that different diameterraindrops have different contributions to microphysical parameters at different heights. For small raindrops (D≤1.0 mm), the contribution rate to rainfall intensity, reflectivity factor, liquid water content, and total number concentration decreases with degression of height meanwhile the contribution rate to these parameters increasesas height decreasing for medium raindrops（1.0 mm＜D≤3.0mm）and large raindrops. Besides, the evaporation and coalescence effect of raindrops show varieties in different precipitation stages. In the antecedent precipitation period, the evaporation effect of raindrops is stronger with higher temperature and lower relative humidity during the falling process.In the precipitation concentration period,the collision coalescence effect of raindrops is more obvious with the relative humidity approaching saturation meanwhile this effect of raindrops is particularly significant in the convective precipitation period.