During experimental period

Wudu

in Zhouqu and Wenxian Counties

there had been forecasted 16 times of disaster Successfully and prevented 7021 peoples from injury and death

and reduced the loss of property being equal to 20761500 Chinese Yuan. The ratio between input and benefit is 1:8.65. At the same time

75 dangerous places of landslide and debris flow were treated in time to ensure 73677 people's life and the property valued 255092000 Yuan safety in the risk area. It is showed that mass monitoring and mass preventing are low cost and high benefit. Through these triales

it not only lowered the degree of the loss on disaster in mountainous area to be smallest

but also probed into the method

accumulated the experiences

and found the way of disaster prevention and reduction

which depends on the station of forecast and warning

which takes mass monitoring and mass preventing as foundation of landslide and debris flow forecasting and warning. It laid a good foundation for popularizing mass monitoring and mass preventing on a large scale.