There were two types of kilns historically used in Yixing: Snake Kilns and “Modern Tunnel” Kilns. Later, gas and electric kilns came to be used instead.
Snake kilns were used throughout China for thousands of years, and the only type of kiln in use up to 1957. Snake kilns are simple, single-column climbing kilns made of clay and brick with a frontal firing chamber, air and fuel ports along the side, and a tall chimney at the far end. The kiln is set on a slope with the chimney at the highest point, which causes a consistent oxygen flow due to the heat rising up the slope and out of the chimney. These kilns could be up to 60 meters long and burn for over a week (though they would have been shorter and faster for yixing firings).