Hydrological regimes of the flood occurred in Dali River on July 26, 2017 were introduced. The amounts of runoff andsediment of this flood were calculated and compared with the history floods. It is found that peak flow and runoff are higher thanthe history floods, and sediment is in the middle of the group. The results show that the underlying surface of the Dali River basinhas changed in some degree, after the harness of soil and water conservation and the implementation of ecological restoration policyfor several decades. However, with the occurrence of high intensity rainfall such as “7·26”, it will generate large peak discharge,runoff and relatively large amount of sand.