Raindrop characteristics, including speed and size of raindrops, in Zhengzhou city of Yellow River basin were analyzed through a natural rainfall on the loess slope. Results showed that the process of natural rainfall belonged to a parabola and counts, size and terminal velocity would increase with the rainfall intensity rising. Besides, the size and terminal velocity of natural raindrops were relatively scattered; In the process of individual rainfall, the terminal velocity and its peak value were mainly focused between l~4.2m/s and 1.4-3.4m/s, respectively. Size of raindrops were mainly consisted of 0.125-0.5mm, The final velocity of 0.125mm is mainly between l-3.4m/s, and the final velocity of the raindrops with 0.25mm particle size is mainly concentrated on the range of l-4.2m/s, 0.375mm diameter of the raindrops mainly concentrated on the l-3.4m/s, the 0.5mm diameter of the raindrops mainly concentrated on the 3.4-4.2m/s.
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