Introduction to Tianchi: is a supporting project of the hydropower plant. It was completed in October 1947. It covers an area of ​​more than 4,000 square meters and the water drop is 93 meters. Because it is built on the mountainside, it is commonly known as Tianchi. It is the crystallization of the military and civilians fighting hand in hand and fighting side by side. It is a vivid teaching material for patriotism education and a cultural landscape.