Based on the monthly runoff series from the representative control stations of the four basins from 1950 to 2011, the concentration degree (Cd), concentration period (Cp), uneven coefficient (Cv) were used to study the distribution characteristics and law. And m-k test method was used to study the monthly runoff trend. The results show that from the south to north in Henan Province, there is a decrease trend of the monthly runoff concentration degree and heterogeneity, runoff focus has successive backwards, and there are two jump interval. Cd, Cv for the rivers of Yellow, Yiluohe and Weihe are in the low value interval, and Cd, Cv for the Huaihe River and its southern tributaries, the rivers of Hongruhe, Shayinghe and Tangbaihe are in the high value interval. After 1980, the runoff concentration is low, concentration period delay, uneven coefficient become small. In the northern and northwestern rivers, monthly runoff significantly decrease; the southern river runoff in April and May has a significant decrease trend, and increase or decrease trend is not significant in other months; and there is no significant runoff increase or decrease trend in the central, southwestern rivers. The total runoff in flood seasons in the north and northwest rivers have significant decrease trend, and there is no obvious increase or decrease trend in the other rivers.