The blocking river is one of the landslide secondary disasters,which often induces a series of disaster chain,such as barrier lakes and flood,etc. The basic reason for this is that the space area between landslides and rivers is less than the landslide movement distance. The horizontal movement distances is controlled by the induce mechanism,volumes and vertical movement distance of a landslide if the landslide is blocked by the river in the movement process. Therefore,the blocking river of seismic and rainfall landslides can be assessed based on the relationships and prediction models between the horizontal distances and volumes and vertical distances. Based on the data of catastrophic seismic and rainfall landslides which were not significantly blocked by the river and the relationships between apparent coefficients of friction and volumes, the prediction models of horizontal movement distances of seismic and rainfall landslides were obtained by the non-linear regression. In the prediction figures of horizontal distances of different landslide volumes,the dots of landslides of blocking river were obviously far from its corresponding volume curve and the risk of landslide blocking was assessed.