According to the special geographical construction of Laxiwa, northwest Hydropower Design Institute designers used super high and thin arch dam. Dam is 250 meters high, and the bottom is only 49 meters wide. Thick and high proportion is 0.196, lower than the national standard of 0.2, belong to the thin dam. This dam brought many problems to the construction, through continuous research, the builders decided to change the past plane excavation way and take anti arch excavation, it was the first one in the country. Now, the dam has nearly 50 meters high. The dam minimizes the gravity dam of large amount of excavation, a large amount of concrete defects, greatly reduced the cost. In Laxiwa, independent innovation is reflected in every cave support, hillside stabilization, voltage of 750000 volts, the diversion tunnel excavation etc..