The landslides occurred in the place 7 km from the no man land southwest to the Gande Twonship in the Mutuo Country along the Yarlung Zangbo River, and a barrier lake was formed. The commandos of the Water Resources Ministry used advanced 3S technology to solve the problems that can not be resolved by conventional methods under special conditions. They measured and calculated the capacity of the barrier lake, volume of the barrier body, inflow and outflow, outlet width, and outlet images, so as to provide timely and reliable decision basis for the working group of the Ministry of Water Resources for the Mutuo barrier lake.