Abstract: The span of Qinling Mountains affected the geograply and climate between the southern and northern areas to it. And under the influence of the global change, the Qinling Mountains has more affected the runoff and sediment between the southern and northern rivers. Based on long-time observed data about the Hanjiang River and the Weihe River from 1935 to 1999, the change of runoff and sediment were analyzed. The result showed that the annual average runoff of the Hanjiang River and the Weihe River were 592.94 m³/s and 248.26 m³/s respectively from 1935 to 1999, the former was 2.4 times to the latter, but the annual average sediment of the Hanjiang River and the Weihe River were 0.88 kg/m³ and 52.03 kg/m³ respectively, the latter was 60 times approximately of the latter. The Weihe River has more sediment. Then the runoff and sediment of the Hanjiang River and the Weihe River were analyzed from 1981, the result showed that the annual average runoff of the Hanjiang River and the Weihe River were 585.05m³/s and 195.89m³/s respectively, which decreased 27.4% and 1.9% respectively. But the annual average sediment of the Weihe River was 54.85 kg/m³, which increased 4.90% compared to that from 1935 to 1980, and the annual average sediment of the Hanjiang River was 0.41 kg/m³, which decreased 53.41% Compared to that from 1935 to 1980. So from 1981, the annual average runoff of the Hanjiang River and the Weihe River decreased, but the annual average sediment in the Weihe River increased and the Hanjiang River decreased under global climate warming, the former was 133 times of the later. This showed that the climate environment of southern and northern areas to Qinling Mountains responded to the global climate warming.