In response to the water limitation for agricultural production in the cold-arid area of the northwest plateau in Hebei Province,the characters of precipitation,infiltration and runoff were observed.The results showed that the average runoff coefficient of 2°-6°slope farmland was 6.16%.The runoff water became an important foundation for rainfall efficient utilization in this area,such as rainfall convergence,ground water recharge and soil high-efficiency.The results were useful to improve the precipitation ...